linux 5.17.1 disregarding ACK values resulting in stalled TCP connections

* linux 5.17.1 disregarding ACK values resulting in stalled TCP connections
@ 2022-03-30  0:56 Jaco
  2022-03-30  2:01 ` Neal Cardwell
  0 siblings, 1 reply; 38+ messages in thread
From: Jaco @ 2022-03-30  0:56 UTC (permalink / raw)
  To: LKML

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Dear All,

I'm seeing very strange TCP behaviour.  Disabled TCP Segmentation Offload to
try and pinpoint this more closely.

It seems the kernel is ignoring ACKs coming from the remote side in some cases.
In this case, on one of four hosts, and seemingly between this one host and
Google ... (We've have two emails to google stuck on another host due to same
issue, but several hundred others passed out today on that same host).  I also
killed selective ACKs as a test as these are known to sometimes cause issues
for firewalls and "tcp accelerators" (or used to at the very least).

SMTP connection between ourselves and Google ... I'm going to be selective in
copying from tcpdump (full coversation up to the point where I killed it
because it plainly got stuck in a loop is attached).

Connection setup:

00:56:17.055481 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [S], seq 956633779, win 62580, options [mss 8940,nop,nop,TS val 3687705482 ecr 0,nop,wscale 7,tfo  cookie f025dd84b6122510,nop,nop], length 0

00:56:17.217747 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [S.], seq 726465675, ack 956633780, win 65535, options [mss 1440,nop,nop,TS val 3477429218 ecr 3687705482,nop,wscale 8], length 0

00:56:17.218628 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726465676:726465760, ack 956633780, win 256, options [nop,nop,TS val 3477429220 ecr 3687705482], length 84: SMTP: 220 mx.google.com ESMTP e16-20020a05600c4e5000b0038c77be9b2dsi226281wmq.72 - gsmtp

00:56:17.218663 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726465760, win 489, options [nop,nop,TS val 3687705645 ecr 3477429220], length 0

This is pretty normal, we advertise an MSS of 8940 and the return is 1440, thus
we shouldn't send segments larger than that, and they "can't".  I need to
determine if this is some form of offloading or they really are sending >1500
byte frames (which I know won't pass our firewalls without fragmentation so
probably some form of NIC offloading - which if it was active on older 5.8
kernels did not cause problems):

00:56:17.709905 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726465979:726468395, ack 956634111, win 261, options [nop,nop,TS val 3477429710 ecr 3687705973], length 2416: SMTP

00:56:17.709906 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726468395:726470811, ack 956634111, win 261, options [nop,nop,TS val 3477429710 ecr 3687705973], length 2416: SMTP

These are the only two frames I can find that supposedly exceeds the MSS values
(although, they don't exceed our value).

Then everything goes pretty normal for a bit.  The last data we receive from
the remote side before stuff goes wrong:

00:56:18.088725 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726471823:726471919, ack 956634348, win 261, options [nop,nop,TS val 3477430089 ecr 3687706330], length 96: SMTP

We ACK immediately along with the next segment:

00:56:18.088969 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956634348:956635776, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP

Hereafter there is a flurry of data that we transmit, all nicely acknowledged,
no retransmits that I can pick up (eyeballs).

Before a long sequence of TX data we get this ACK:

00:56:18.576247 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956700036, win 774, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0

We then continue to RX a sequence of:

00:56:18.576300 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956745732:956747160, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP

up to:

00:56:18.577031 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956778576:956780004, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP

Before we hit our first retransmit:

00:56:18.960078 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956700036:956701464, ack 726471919, win 446, options [nop,nop,TS val 3687707386 ecr 3477430577], length 1428: SMTP

Since 956700036 is the last ACKed data, this seems correct, not sure what timer
this is based on though, the ACK for the just prior data came in ~384ms prior
(could be based on normal time to ACK, I don't know, this is about double the
usual round-trip-time currently).

And then we receive this ACK (we can see this time the kernel waited for ACK of
this single segment):

00:56:19.126678 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956701464, win 785, options [nop,nop,TS val 3477431127 ecr 3687707386], length 0

Then we do something (in my opinion) strange by jumping back to the tail of the previous burst:

00:56:19.126735 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956780004:956781432, ack 726471919, win 446, options [nop,nop,TS val 3687707553 ecr 3477431127], length 1428: SMTP

00:56:19.126751 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956781432:956782860, ack 726471919, win 446, options [nop,nop,TS val 3687707553 ecr 3477431127], length 1428: SMTP

We then jump back and retransmit again from the just received ACK:

00:56:19.510078 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956701464:956702892, ack 726471919, win 446, options [nop,nop,TS val 3687707936 ecr 3477431127], length 1428: SMTP

We then continue from there on as I'd expect (slow restart), this goes pretty
normal up to:

00:56:19.997088 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956708604, win 841, options [nop,nop,TS val 3477431998 ecr 3687708261], length 0

00:56:19.997148 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956708604:956710032, ack 726471919, win 446, options [nop,nop,TS val 3687708423 ecr 3477431998], length 1428: SMTP

00:56:20.262683 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477432263 ecr 3687708423], length 0

Up to here is fine, now things gets bizarre, we just jump to a different
sequence number, which has already been ACKed:

00:56:20.380076 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq *956707176*:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687708806 ecr 3477431998], length 1428: SMTP

00:56:20.542356 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477432543 ecr 3687708423], length 0

And remote side re-ACKs the 956710032 value, which frankly indicates we need to
realize that the data we are transmitting has already been received, and we can
continue on to transmit the segments following up on sequence number 956710032,
instead we choose to get stuck in this sequence:

00:56:21.180080 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687709606 ecr 3477431998], length 1428: SMTP

00:56:21.342347 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477433343 ecr 3687708423], length 0

00:56:22.780101 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687711206 ecr 3477431998], length 1428: SMTP

00:56:22.942346 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477434943 ecr 3687708423], length 0

And here the connection dies.  It eventually times out, and we retry to the
next host, resulting in the same problem.

I am aware that Google is having congestion issues in the JHB area in SA
currently, and there are probably packet delays and losses somewhere along the
line between us, but this really should not stall as dead as it is here.

Looking at only the incoming ACK values, I can see they are strictly
increasing, so we've never received an ACK > 956710032, but this is still
greater than the value we are retransmitting.

The first time we transmitted the frame at sequence number 956707176 was part
of the longest sequence of TX frames without a returning ACK, part of this
sequence:

...

00:56:18.414299 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956705748:956707176, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP

00:56:18.414302 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP

00:56:18.414316 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956708604:956710032, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP

...

Google here is ACKing not only the frame we are continuously retransmitting,
but also the frame directly after ... so why would the kernel not move on to
retransmitting starting from sequence number 956710032 (which is larger than
the start sequence number of the frame we are retransmitting)?

Kind Regards,
Jaco

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00:56:17.055481 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [S], seq 956633779, win 62580, options [mss 8940,nop,nop,TS val 3687705482 ecr 0,nop,wscale 7,tfo  cookie f025dd84b6122510,nop,nop], length 0
00:56:17.217747 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [S.], seq 726465675, ack 956633780, win 65535, options [mss 1440,nop,nop,TS val 3477429218 ecr 3687705482,nop,wscale 8], length 0
00:56:17.218628 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726465676:726465760, ack 956633780, win 256, options [nop,nop,TS val 3477429220 ecr 3687705482], length 84: SMTP: 220 mx.google.com ESMTP e16-20020a05600c4e5000b0038c77be9b2dsi226281wmq.72 - gsmtp
00:56:17.218663 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726465760, win 489, options [nop,nop,TS val 3687705645 ecr 3477429220], length 0
00:56:17.218754 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956633780:956633803, ack 726465760, win 489, options [nop,nop,TS val 3687705645 ecr 3477429220], length 23: SMTP: EHLO uriel.iewc.co.za
00:56:17.380021 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956633803, win 256, options [nop,nop,TS val 3477429381 ecr 3687705645], length 0
00:56:17.383685 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726465760:726465949, ack 956633803, win 256, options [nop,nop,TS val 3477429384 ecr 3687705645], length 189: SMTP: 250-mx.google.com at your service, [2c0f:f720:0:3:d6ae:52ff:feb8:f27b]
00:56:17.383714 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726465949, win 488, options [nop,nop,TS val 3687705810 ecr 3477429384], length 0
00:56:17.383934 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956633803:956633813, ack 726465949, win 488, options [nop,nop,TS val 3687705810 ecr 3477429384], length 10: SMTP: STARTTLS
00:56:17.546391 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726465949:726465979, ack 956633813, win 256, options [nop,nop,TS val 3477429547 ecr 3687705810], length 30: SMTP: 220 2.0.0 Ready to start TLS
00:56:17.546430 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726465979, win 488, options [nop,nop,TS val 3687705973 ecr 3477429547], length 0
00:56:17.547288 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956633813:956634111, ack 726465979, win 488, options [nop,nop,TS val 3687705973 ecr 3477429547], length 298: SMTP
00:56:17.709905 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726465979:726468395, ack 956634111, win 261, options [nop,nop,TS val 3477429710 ecr 3687705973], length 2416: SMTP
00:56:17.709906 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726468395:726470811, ack 956634111, win 261, options [nop,nop,TS val 3477429710 ecr 3687705973], length 2416: SMTP
00:56:17.709906 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726470811:726470898, ack 956634111, win 261, options [nop,nop,TS val 3477429711 ecr 3687705973], length 87: SMTP
00:56:17.709949 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726468395, win 470, options [nop,nop,TS val 3687706136 ecr 3477429710], length 0
00:56:17.709964 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726470811, win 452, options [nop,nop,TS val 3687706136 ecr 3477429710], length 0
00:56:17.709978 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726470898, win 452, options [nop,nop,TS val 3687706136 ecr 3477429711], length 0
00:56:17.712221 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956634111:956634191, ack 726470898, win 452, options [nop,nop,TS val 3687706138 ecr 3477429711], length 80: SMTP
00:56:17.712353 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956634191:956634236, ack 726470898, win 452, options [nop,nop,TS val 3687706138 ecr 3477429711], length 45: SMTP
00:56:17.874774 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956634236, win 261, options [nop,nop,TS val 3477429875 ecr 3687706138], length 0
00:56:17.875264 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726470898:726471633, ack 956634236, win 261, options [nop,nop,TS val 3477429876 ecr 3687706138], length 735: SMTP
00:56:17.904288 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956634236:956634348, ack 726471633, win 447, options [nop,nop,TS val 3687706330 ecr 3477429876], length 112: SMTP
00:56:18.066936 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726471633:726471728, ack 956634348, win 261, options [nop,nop,TS val 3477430067 ecr 3687706330], length 95: SMTP
00:56:18.088465 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726471728:726471823, ack 956634348, win 261, options [nop,nop,TS val 3477430089 ecr 3687706330], length 95: SMTP
00:56:18.088603 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], ack 726471823, win 446, options [nop,nop,TS val 3687706515 ecr 3477430067], length 0
00:56:18.088725 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [P.], seq 726471823:726471919, ack 956634348, win 261, options [nop,nop,TS val 3477430089 ecr 3687706330], length 96: SMTP
00:56:18.088969 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956634348:956635776, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.088973 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956635776:956637204, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.088988 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956637204:956638632, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.088990 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956638632:956640060, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.089099 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956640060:956641488, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.089103 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956641488:956642916, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.089117 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956642916:956644344, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.089119 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956644344:956645772, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.089226 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956645772:956647200, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.089229 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956647200:956648628, ack 726471919, win 446, options [nop,nop,TS val 3687706515 ecr 3477430089], length 1428: SMTP
00:56:18.251223 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956637204, win 283, options [nop,nop,TS val 3477430252 ecr 3687706515], length 0
00:56:18.251223 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956640060, win 305, options [nop,nop,TS val 3477430252 ecr 3687706515], length 0
00:56:18.251224 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956642916, win 328, options [nop,nop,TS val 3477430252 ecr 3687706515], length 0
00:56:18.251224 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956645772, win 350, options [nop,nop,TS val 3477430252 ecr 3687706515], length 0
00:56:18.251295 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956648628:956650056, ack 726471919, win 446, options [nop,nop,TS val 3687706677 ecr 3477430252], length 1428: SMTP
00:56:18.251299 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956650056:956651484, ack 726471919, win 446, options [nop,nop,TS val 3687706677 ecr 3477430252], length 1428: SMTP
00:56:18.251314 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956651484:956652912, ack 726471919, win 446, options [nop,nop,TS val 3687706677 ecr 3477430252], length 1428: SMTP
00:56:18.251317 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956652912:956654340, ack 726471919, win 446, options [nop,nop,TS val 3687706677 ecr 3477430252], length 1428: SMTP
00:56:18.251378 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956648628, win 372, options [nop,nop,TS val 3477430252 ecr 3687706515], length 0
00:56:18.251430 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956654340:956655768, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251435 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956655768:956657196, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251455 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956657196:956658624, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251458 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956658624:956660052, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251563 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956660052:956661480, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251566 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956661480:956662908, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251583 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956662908:956664336, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251585 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956664336:956665764, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251694 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956665764:956667192, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251697 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956667192:956668620, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251713 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956668620:956670048, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251716 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956670048:956671476, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251826 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956671476:956672904, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251829 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956672904:956674332, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251841 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956674332:956675760, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.251844 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956675760:956677188, ack 726471919, win 446, options [nop,nop,TS val 3687706678 ecr 3477430252], length 1428: SMTP
00:56:18.413569 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956651484, win 395, options [nop,nop,TS val 3477430414 ecr 3687706677], length 0
00:56:18.413569 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956654340, win 417, options [nop,nop,TS val 3477430414 ecr 3687706677], length 0
00:56:18.413569 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956657196, win 439, options [nop,nop,TS val 3477430414 ecr 3687706678], length 0
00:56:18.413570 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956660052, win 461, options [nop,nop,TS val 3477430414 ecr 3687706678], length 0
00:56:18.413570 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956662908, win 484, options [nop,nop,TS val 3477430414 ecr 3687706678], length 0
00:56:18.413570 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956665764, win 506, options [nop,nop,TS val 3477430414 ecr 3687706678], length 0
00:56:18.413635 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956677188:956678616, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413639 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956678616:956680044, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413655 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956680044:956681472, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413657 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956681472:956682900, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413774 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956682900:956684328, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413780 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956684328:956685756, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413807 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956685756:956687184, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413810 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956687184:956688612, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413854 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956668620, win 528, options [nop,nop,TS val 3477430414 ecr 3687706678], length 0
00:56:18.413854 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956671476, win 551, options [nop,nop,TS val 3477430414 ecr 3687706678], length 0
00:56:18.413920 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956688612:956690040, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413920 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956674332, win 573, options [nop,nop,TS val 3477430415 ecr 3687706678], length 0
00:56:18.413920 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956677188, win 595, options [nop,nop,TS val 3477430415 ecr 3687706678], length 0
00:56:18.413924 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956690040:956691468, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413938 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956691468:956692896, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.413940 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956692896:956694324, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430414], length 1428: SMTP
00:56:18.414048 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956694324:956695752, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414052 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956695752:956697180, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414065 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956697180:956698608, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414067 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956698608:956700036, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414174 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956700036:956701464, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414177 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956701464:956702892, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414190 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956702892:956704320, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414192 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956704320:956705748, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414299 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956705748:956707176, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414302 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414316 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956708604:956710032, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414318 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956710032:956711460, ack 726471919, win 446, options [nop,nop,TS val 3687706840 ecr 3477430415], length 1428: SMTP
00:56:18.414424 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956711460:956712888, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414427 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956712888:956714316, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414440 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956714316:956715744, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414442 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956715744:956717172, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414546 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956717172:956718600, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414550 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956718600:956720028, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414562 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956720028:956721456, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414565 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956721456:956722884, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414670 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956722884:956724312, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414673 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956724312:956725740, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414685 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956725740:956727168, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414687 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956727168:956728596, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414793 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956728596:956730024, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414796 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956730024:956731452, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414809 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956731452:956732880, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.414811 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956732880:956734308, ack 726471919, win 446, options [nop,nop,TS val 3687706841 ecr 3477430415], length 1428: SMTP
00:56:18.575940 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956680044, win 618, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.575940 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956682900, win 640, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.575940 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956685756, win 662, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.575940 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956688612, win 685, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.575940 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956691468, win 707, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.576005 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956734308:956735736, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576010 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956735736:956737164, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576025 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956737164:956738592, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576028 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956738592:956740020, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576066 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956694324, win 729, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.576146 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956740020:956741448, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576152 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956741448:956742876, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576180 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956742876:956744304, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576184 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956744304:956745732, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576247 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956697180, win 752, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.576247 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956700036, win 774, options [nop,nop,TS val 3477430577 ecr 3687706840], length 0
00:56:18.576300 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956745732:956747160, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576304 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956747160:956748588, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576325 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956748588:956750016, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576328 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956750016:956751444, ack 726471919, win 446, options [nop,nop,TS val 3687707002 ecr 3477430577], length 1428: SMTP
00:56:18.576441 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956751444:956752872, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576445 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956752872:956754300, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576467 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956754300:956755728, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576470 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956755728:956757156, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576582 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956757156:956758584, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576586 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956758584:956760012, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576606 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956760012:956761440, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576609 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956761440:956762868, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576722 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956762868:956764296, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576726 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956764296:956765724, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576746 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956765724:956767152, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576749 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956767152:956768580, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576863 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956768580:956770008, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576867 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956770008:956771436, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576889 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956771436:956772864, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.576892 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956772864:956774292, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.577004 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956774292:956775720, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.577008 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956775720:956777148, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.577028 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956777148:956778576, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.577031 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956778576:956780004, ack 726471919, win 446, options [nop,nop,TS val 3687707003 ecr 3477430577], length 1428: SMTP
00:56:18.960078 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956700036:956701464, ack 726471919, win 446, options [nop,nop,TS val 3687707386 ecr 3477430577], length 1428: SMTP
00:56:19.126678 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956701464, win 785, options [nop,nop,TS val 3477431127 ecr 3687707386], length 0
00:56:19.126735 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956780004:956781432, ack 726471919, win 446, options [nop,nop,TS val 3687707553 ecr 3477431127], length 1428: SMTP
00:56:19.126751 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956781432:956782860, ack 726471919, win 446, options [nop,nop,TS val 3687707553 ecr 3477431127], length 1428: SMTP
00:56:19.510078 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956701464:956702892, ack 726471919, win 446, options [nop,nop,TS val 3687707936 ecr 3477431127], length 1428: SMTP
00:56:19.672429 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956702892, win 796, options [nop,nop,TS val 3477431673 ecr 3687707936], length 0
00:56:19.672489 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956702892:956704320, ack 726471919, win 446, options [nop,nop,TS val 3687708099 ecr 3477431673], length 1428: SMTP
00:56:19.672494 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [P.], seq 956704320:956705748, ack 726471919, win 446, options [nop,nop,TS val 3687708099 ecr 3477431673], length 1428: SMTP
00:56:19.834765 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956704320, win 807, options [nop,nop,TS val 3477431835 ecr 3687708099], length 0
00:56:19.834765 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956705748, win 818, options [nop,nop,TS val 3477431835 ecr 3687708099], length 0
00:56:19.834818 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956705748:956707176, ack 726471919, win 446, options [nop,nop,TS val 3687708261 ecr 3477431835], length 1428: SMTP
00:56:19.834846 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687708261 ecr 3477431835], length 1428: SMTP
00:56:19.997087 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956707176, win 830, options [nop,nop,TS val 3477431998 ecr 3687708261], length 0
00:56:19.997088 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956708604, win 841, options [nop,nop,TS val 3477431998 ecr 3687708261], length 0
00:56:19.997148 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956708604:956710032, ack 726471919, win 446, options [nop,nop,TS val 3687708423 ecr 3477431998], length 1428: SMTP
00:56:20.262683 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477432263 ecr 3687708423], length 0
00:56:20.380076 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687708806 ecr 3477431998], length 1428: SMTP
00:56:20.542356 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477432543 ecr 3687708423], length 0
00:56:21.180080 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687709606 ecr 3477431998], length 1428: SMTP
00:56:21.342347 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477433343 ecr 3687708423], length 0
00:56:22.780101 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687711206 ecr 3477431998], length 1428: SMTP
00:56:22.942346 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477434943 ecr 3687708423], length 0
00:56:25.900090 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687714326 ecr 3477431998], length 1428: SMTP
00:56:26.062272 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477438063 ecr 3687708423], length 0
00:56:32.620090 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687721046 ecr 3477431998], length 1428: SMTP
00:56:32.782226 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477444783 ecr 3687708423], length 0
00:56:45.420093 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687733846 ecr 3477431998], length 1428: SMTP
00:56:45.581587 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477457582 ecr 3687708423], length 0
00:57:10.380083 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687758806 ecr 3477431998], length 1428: SMTP
00:57:10.542248 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477482543 ecr 3687708423], length 0
00:58:00.940090 IP6 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110 > 2a00:1450:400c:c07::1b.25: Flags [.], seq 956707176:956708604, ack 726471919, win 446, options [nop,nop,TS val 3687809366 ecr 3477431998], length 1428: SMTP
00:58:01.102342 IP6 2a00:1450:400c:c07::1b.25 > 2c0f:f720:0:3:d6ae:52ff:feb8:f27b.59110: Flags [.], ack 956710032, win 852, options [nop,nop,TS val 3477533103 ecr 3687708423], length 0

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