----- hermann@xxxxxxx wrote: > Hi, > I today upgraded my KVM host from Debian 8 to the latest Debian 9 > (Stretch). This worked perfectly, however, 2 old guest systems (SuSE > 9.1, kernel 2.6.7 / 2.6.5) have no network access. > > All other machines running on this host are Linux Debian machines and > use the "virtio" networking drivere whereas those two old machines > use > RTL8139 (or e1000, makes no difference). > > On the guest side, the networking interface (eth0 / rtl8139) is up, > it > states "Link Up / 100MBit" in the log file, everything looks fine, but > I > can't get out, no ping, empty arp table etc. > > Basically, I use bridging for the virtual hosts, this looks like > this: > > br0 8000.0026186273f4 no eth0 > vnet0 > vnet1 > > or like so: > > port no mac addr is local? ageing timer > 1 00:00:24:cc:c7:85 no 0.42 > 1 00:19:66:b3:cb:34 no 3.97 > 1 00:22:b0:cf:04:b2 no 0.03 > > > What is interesting is that I cannot find the MAC Address of the 2 > machines in the above table, which is probably not good. > > Forwarding is enabled for all bridges and there is no packet filter / > firewall. > > I have no clue how to solve this problem - do you have any idea? > > Kernel version (uname -rv): > Linux version 4.9.0-5-amd64 (debian-kernel@xxxxxxxxxxxxxxxx) (gcc > version 6.3.0 20170516 (Debian 6.3.0-18) ) #1 SMP Debian > 4.9.65-3+deb9u2 > (2018-01-04) > > kvm --version: > QEMU emulator version 2.8.1(Debian 1:2.8+dfsg-6+deb9u3) > > > Best Regards, > Hermann > > -- > hermann@xxxxxxx > PGP/GPG: 299893C7 (on keyservers) 1. What do you see when sniffing (with tcpdump) the QEMU's tap devices which represent the guest's NICs? Do you see any traffic there? 2. Examining the KVM events trace may also be helpful. It's very easy to extract: # echo 1 >/sys/kernel/debug/tracing/events/kvm/enable # cat /sys/kernel/debug/tracing/trace_pipe > /tmp/trace # echo 0 >/sys/kernel/debug/tracing/events/kvm/enable Regards, -Liran
