Re: Does the debian kernel sends the gratuitous arp ?

From	Balaji G <gbalajieie@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: Does the debian kernel sends the gratuitous arp ?
Date	2023-10-09 17:30 +0200
Message-ID	<Hn0mJ-eFFq-1@gated-at.bofh.it> (permalink)
References	<HlShz-dWb7-5@gated-at.bofh.it> <Hm0yt-e15d-1@gated-at.bofh.it> <Hmv9f-ekzq-1@gated-at.bofh.it> <HmxNL-elUg-3@gated-at.bofh.it> <HmDTb-epD5-1@gated-at.bofh.it>
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Hi Geert,

 >>> During `ip link set down dev eno5np0` and `ip link set up dev eno5np0`

>>>>> are NO IP-addresses involved.

This interface eno5np0 is configured with the ip addresses(10.45.10.4 ).

# ifconfig

eno5np0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.45.10.4  netmask 255.255.255.0  broadcast 10.45.10.255
        ether 88:e9:a4:49:18:48  txqueuelen 1000  (Ethernet)
        RX packets 2967346895  bytes 4417546189260 (4.0 TiB)
        RX errors 0  dropped 1  overruns 0  frame 0
        TX packets 1634521866  bytes 2220475762246 (2.0 TiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



Thanks,

Balaji



On Sun, 8 Oct 2023 at 20:58, Jeffrey Walton <noloader@gmail.com> wrote:

> On Sun, Oct 8, 2023 at 4:58 AM Geert Stappers <stappers@debian.org> wrote:
> >
> > On Sun, Oct 08, 2023 at 11:21:10AM +0530, Balaji G wrote:
> > > On Sat, 7 Oct 2023 at 02:50, Jeffrey Walton wrote:
> > > > On Fri, Oct 6, 2023 at 2:04 PM 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.
> > > > >
> > > > > # 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
> > > >
> > >
> > > Do you mean this is a known issue & will be fixed in the future
> releases ?
> >
> > Here not Jeff.  What I do understand from Jeff message is
> > something like:  "I can bitch on systemd, so I do"
> > Time will tell how much Jeff contributes in solving
> > the interesting problem of the invisible gratuitous ARP.
>
> Nope, not that.
>
> I learned a long time ago to answer the question that was asked in the
> body of the post.
>
> You're welcome to complain about Systemd all you like. You won't get
> any complaints from me. It's not a discussion I will engage in.
>
> Jeff
>

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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