So I used vzdump --restore to restore a container from another server, seemed to work fine. Everything seems to be there, I compared vz.conf with another one I made on the box, but...
When I run vzctl start it says it started fine, but then the server crashes after about 3 seconds later.
vzctl start 101
Starting container ...
Initializing quota ...
Container is mounted
Adding IP address(es): 91.121.xx
arpsend: 91.121.xx is detected on another computer : 00:00:0c:07:ac:01
vps-net_add WARNING: arpsend -c 1 -w 1 -D -e 91.121.xx eth0 FAILED
Setting CPU limit: 400
Setting CPU units: 1000
Setting CPUs: 4
Container start in progress...
server #