gitea-pages/engineering-guide/troubleshooting.md

Troubleshooting

Network Issues

To be able to debug early network issues in the boot process the 2 test VMs lxdev04 and lxdev05 have network port mirroring enabled.

I.e. lxdev04 has a second interface that mirrors the primary interface of lxdev05 and lxdev05 has a second interface that mirrors the primary interface of lxdev04.

Bring the device up without IP address:

ip link set dev ens192 up
ip addr flush dev ens192

and then use tcpdump -i ens192 ...