Oleg wrote: > 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.
Can you tell us about networking on the host, please? ip link show ip addr show ip route show cat /proc/sys/net/ipv4/ip_forward would be a good start. Also, are you running a firewall of any kind on the server itself? -dsr-
