Re: Does the debian kernel sends the gratuitous arp ?

[Balaji G <gbalajieie@gmail.com>]

Hi Jeff,

           Do you mean this is a known issue & will be fixed in the future releases ?

Thanks,

Balaji

On Sat, 7 Oct 2023 at 02:50, Jeffrey Walton <noloader@gmail.com> wrote:

On Fri, Oct 6, 2023 at 2:04 PM Balaji G <gbalajieie@gmail.com> 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.
>
> # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify
> # ip link set down dev eno5np0
> # ip link set up dev eno5np0
>
> Captured all the packets via tcpdump & the tcpdump is not showing any Gratuitous ARP packets.
>
> But, with the same commands i could see the Gratuitous ARP being sent in Red hat.9.0 (Plow).
> So, please let me know if this is a specific scenario in Debian 11 ??

I think that's now Poettering:
https://github.com/systemd/systemd/blob/main/src/libsystemd-network/sd-ipv4acd.c#L302

Jeff