* Does arping update arp table?
@ 2015-01-27 19:23 Murali Karicheri
2015-01-27 20:46 ` David Ahern
0 siblings, 1 reply; 3+ messages in thread
From: Murali Karicheri @ 2015-01-27 19:23 UTC (permalink / raw)
To: netdev; +Cc: David Miller
Experts,
The ARP code (net/ipv4/arp.c) seems to treat arp response resulting from
a arping as an unsolicited response and doesn't update the arp table.
This get updated if the per interface accept sys ctrl is enabled. This
command seems to have been updating the arp table in older kernel. For
example on a Ubuntu 12.04 based kernel I see
a0868495@ula0868495 ~/Project/linux-keystone $ sudo arping 192.168.1.10
-c 1 -f
ARPING 192.168.1.10 from 192.168.1.9 eth0
Unicast reply from 192.168.1.10 [00:1B:A9:02:26:10] 5.411ms
Sent 1 probes (1 broadcast(s))
Received 1 response(s)
a0868495@ula0868495 ~/Project/linux-keystone $ arp -n -a
? (192.168.1.10) at 00:1b:a9:02:26:10 [ether] on eth0
? (192.168.1.1) at 00:1f:90:6d:5c:a8 [ether] on eth0
a0868495@ula0868495 ~/Project/linux-keystone $ uname -a
Linux ula0868495 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:41:14 UTC
2012 i686 i686 i386 GNU/Linux
However this command doesn't update the arp table on my Keystone EVM
based on v3.19.x and also newer ubuntu machine based on v3.11. Is this
expected behavior? I believe the arp response resulting from a arping
command is controlled through per interface accept sys control like as
in gratuitous arp. Please repond.
Thanks and regards,
--
Murali Karicheri
Linux Kernel, Texas Instruments
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Does arping update arp table?
2015-01-27 19:23 Does arping update arp table? Murali Karicheri
@ 2015-01-27 20:46 ` David Ahern
2015-01-27 21:12 ` Murali Karicheri
0 siblings, 1 reply; 3+ messages in thread
From: David Ahern @ 2015-01-27 20:46 UTC (permalink / raw)
To: Murali Karicheri, netdev; +Cc: David Miller
On 1/27/15 12:23 PM, Murali Karicheri wrote:
> However this command doesn't update the arp table on my Keystone EVM
> based on v3.19.x and also newer ubuntu machine based on v3.11. Is this
> expected behavior? I believe the arp response resulting from a arping
> command is controlled through per interface accept sys control like as
> in gratuitous arp. Please repond.
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_accept
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Does arping update arp table?
2015-01-27 20:46 ` David Ahern
@ 2015-01-27 21:12 ` Murali Karicheri
0 siblings, 0 replies; 3+ messages in thread
From: Murali Karicheri @ 2015-01-27 21:12 UTC (permalink / raw)
To: David Ahern; +Cc: netdev, David Miller
On 01/27/2015 03:46 PM, David Ahern wrote:
> On 1/27/15 12:23 PM, Murali Karicheri wrote:
>> However this command doesn't update the arp table on my Keystone EVM
>> based on v3.19.x and also newer ubuntu machine based on v3.11. Is this
>> expected behavior? I believe the arp response resulting from a arping
>> command is controlled through per interface accept sys control like as
>> in gratuitous arp. Please repond.
>
> echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_accept
>
Thanks. That is what I thought.
--
Murali Karicheri
Linux Kernel, Texas Instruments
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-01-27 19:23 Does arping update arp table? Murali Karicheri
2015-01-27 20:46 ` David Ahern
2015-01-27 21:12 ` Murali Karicheri
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