Re: Does the debian kernel sends the gratuitous arp ?
On Fri, Oct 06, 2023 at 05:52:16PM +0530, Balaji G wrote:
> Hi,
> I am using "Debian GNU/Linux 11 (bullseye)" with kernel version 5.16.12.
> When i do a link up/down i don't see any Gratuitous ARP being sent.
ARP
> # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify
Probably transmitted "I tried to enforce ARP notification"
> # ip link set down dev eno5np0
> # ip link set up dev eno5np0
link
> Captured all the packets via tcpdump & the tcpdump is not showing any
> Gratuitous ARP packets.
Why should it? (Yes, that is a serious question.)
> But, with the same commands i could see the Gratuitous ARP being sent in
> Red hat.9.0 (Plow).
I think more factors have been change as kernel.
> So, please let me know if this is a specific scenario in Debian 11 ??
I state that the OP, Original Poster, is the specific scenario.
Yeah, that is a blunt statement. Now hear me out.
Gratuitous ARP is "linking" MAC-address and IP-address.
During `ip link set down dev eno5np0` and `ip link set up dev eno5np0`
are NO IP-addresses involved.
So there is no need for ARP.
I do hope to see a follow-up message like:
Re-did the test with a static IP-address on the interface
and indeed see a gratuitous ARP
or some thing like
To reproduce the missing gratuitous ARP do ...
Yeah, that might reveal more information about dev eno5np0.
> Thanks,
> Balaji
Groeten
Geert Stappers
--
Silence is hard to parse
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