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Re: Does the debian kernel sends the gratuitous arp ?

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On Fri, Oct 06, 2023 at 05:20:22PM -0400, Jeffrey Walton 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

As  Geert says, probably it needs an ip address to be able to send
an ARP. Perhaps the Redhat box has one set by default?

What does "ip addr show dev xxxx" say?

Cheers
-- 
t

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Thread

Does the debian kernel sends the gratuitous arp ? Balaji G <gbalajieie@gmail.com> - 2023-10-06 14:40 +0200
  Re: Does the debian kernel sends the gratuitous arp ? Geert Stappers <stappers@stappers.nl> - 2023-10-06 21:20 +0200
    Re: Does the debian kernel sends the gratuitous arp ? Geert Stappers <stappers@debian.org> - 2023-10-08 11:20 +0200
      Re: Does the debian kernel sends the gratuitous arp ? debian-user@howorth.org.uk - 2023-10-08 19:30 +0200
  Re: Does the debian kernel sends the gratuitous arp ? Jeffrey Walton <noloader@gmail.com> - 2023-10-06 23:30 +0200
    Re: Does the debian kernel sends the gratuitous arp ? <tomas@tuxteam.de> - 2023-10-07 07:40 +0200
      Re: Does the debian kernel sends the gratuitous arp ? Jeffrey Walton <noloader@gmail.com> - 2023-10-07 18:00 +0200
    Re: Does the debian kernel sends the gratuitous arp ? Balaji G <gbalajieie@gmail.com> - 2023-10-08 08:10 +0200
      Re: Does the debian kernel sends the gratuitous arp ? Geert Stappers <stappers@debian.org> - 2023-10-08 11:00 +0200
        Re: Does the debian kernel sends the gratuitous arp ? Jeffrey Walton <noloader@gmail.com> - 2023-10-08 17:30 +0200
          Re: Does the debian kernel sends the gratuitous arp ? Balaji G <gbalajieie@gmail.com> - 2023-10-09 17:30 +0200
            Re: Does the debian kernel sends the gratuitous arp ? Geert Stappers <stappers@debian.org> - 2023-10-09 22:30 +0200
              Re: Does the debian kernel sends the gratuitous arp ? Geert Stappers <stappers@stappers.nl> - 2023-10-11 22:20 +0200
            Re: Does the debian kernel sends the gratuitous arp ? Balaji G <gbalajieie@gmail.com> - 2023-10-10 06:10 +0200

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