* ipv4 dead route delete notification on netdev down
@ 2014-09-21 4:02 Roopa Prabhu
2014-09-21 4:08 ` David Miller
2014-09-22 8:26 ` Nicolas Dichtel
0 siblings, 2 replies; 3+ messages in thread
From: Roopa Prabhu @ 2014-09-21 4:02 UTC (permalink / raw)
To: netdev; +Cc: David Miller, Stephen Hemminger, nicolas.dichtel, Thomas Graf
Hi,
The kernel does not send notification for deleted dead ipv4 routes on
netdev down.
This has been brought up before and patches for the fix have been rejected.
The reason for rejection is that the routing daemons are expected to
purge their
routing tables on netdev down notifications.
http://www.spinics.net/lists/netdev/msg215161.html
http://lists.openwall.net/netdev/2013/10/17/55
This issue keeps coming back. We run into this too. Wanted to send this
email out to see if opinions have changed.
There are multiple problems:
1) inconsistency in kernel notification behavior between ipv4 and ipv6
for dead routes
2) Its not just the routing daemons, its also the userspace netlink
caches like libnl. In abcense of a direct notification,
these will have to purge the routes on link down too.
Thanks,
Roopa
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ipv4 dead route delete notification on netdev down
2014-09-21 4:02 ipv4 dead route delete notification on netdev down Roopa Prabhu
@ 2014-09-21 4:08 ` David Miller
2014-09-22 8:26 ` Nicolas Dichtel
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2014-09-21 4:08 UTC (permalink / raw)
To: roopa; +Cc: netdev, stephen, nicolas.dichtel, tgraf
From: Roopa Prabhu <roopa@cumulusnetworks.com>
Date: Sat, 20 Sep 2014 21:02:28 -0700
> This issue keeps coming back. We run into this too. Wanted to send
> this email out to see if opinions have changed.
My opinion has not changed.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ipv4 dead route delete notification on netdev down
2014-09-21 4:02 ipv4 dead route delete notification on netdev down Roopa Prabhu
2014-09-21 4:08 ` David Miller
@ 2014-09-22 8:26 ` Nicolas Dichtel
1 sibling, 0 replies; 3+ messages in thread
From: Nicolas Dichtel @ 2014-09-22 8:26 UTC (permalink / raw)
To: Roopa Prabhu, netdev; +Cc: David Miller, Stephen Hemminger, Thomas Graf
Le 21/09/2014 06:02, Roopa Prabhu a écrit :
> Hi,
>
> The kernel does not send notification for deleted dead ipv4 routes on netdev down.
Not only on netdev down. If you remove the last IPv4 address, the kernel will
also purge its routing table without any notification :/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-09-21 4:02 ipv4 dead route delete notification on netdev down Roopa Prabhu
2014-09-21 4:08 ` David Miller
2014-09-22 8:26 ` Nicolas Dichtel
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