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IPv4 networking problem after dist-upgrade

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Hi there,

I've updated my server to bullseye a couple of days ago and since then I'm
unable to get IPv4 networking to work properly again. IPv6 still seems to work
like charm. I can also connect to the hosted VMs (KVM via libvirt) on the
server over IPv4 without problems. However, when I try to address the server
directly, all packets seem to be dropped on the outgoing interface. If, for
instance, I ping the server, I can see the ICMPv4 echo requests _and_ replies
in tcpdump, but the pinging peer won't never receive the replies. If I check
the ARP tables I can find the gateway's MAC address tagged as DELAY. 

The general setup has worked before the dist-upgrade for years and I'm a bit
clueless what might has been broken during the update.

Cheers
Oleg

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Thread

IPv4 networking problem after dist-upgrade Oleg <gandalf+debian@stillroot.org> - 2021-10-06 14:50 +0200
  Re: IPv4 networking problem after dist-upgrade Dan Ritter <dsr@randomstring.org> - 2021-10-06 16:30 +0200
    Re: IPv4 networking problem after dist-upgrade Oleg <gandalf+debian@stillroot.org> - 2021-10-06 18:10 +0200
      Re: IPv4 networking problem after dist-upgrade Oleg <gandalf+debian@stillroot.org> - 2021-10-06 21:10 +0200

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