[arch-general] A question about handling a system with two wired network interfaces?

[Tom Gundersen]

Hi Mike,

Lots of stuff going on, so sorry for not answering inline.

 * It looks like NetworkManager and dhcpd are stepping on eachother's
toes. Maybe you want to disable dhcpd and only use NM?

* Any service that cannot deal with network devices appearing or being
rename after it is started (is broken and) should have the
After/Wants=systemd-udev-settle.service lines you pasted above. Note
that this is not a perfect solution, as udev never knows exactly how
long to wait for all the network devices, but it is the best we can do
and gives the same behavior as we had pre-systemd.

 * I never used the dhcpd4 (only ever used dhcpcd), but in principle
the correct solution should be to make it one instance per network
device (i.e., create an dhcpd4 at .service similar to dhcpcd at .service
from the dhcpcd package). This would make sure it is only started
after the relevant network device appears (and have been given its
final name), and it should also make dhpcd itself happy (as it seems
to not like being called without a specific interface judging from
your logs).

HTH,

Tom