Hi, 

with the packages from debian.systs.org I also hat the

arpsend: can't get iface 'eth0:' address : Cannot assign requested address

problem. The real problem is the ':'... Change /usr/share/vz/vps-functions with 

100c97
<       awk "/^[0-9].*:/&&/UP/ {print substr(\\$2, 0, length(\\$2))}"`
---
>       awk "/^[0-9].*:/&&/UP/ {print substr(\\$2, 0, length(\\$2)-1)}"`

and networking works as expected...