[tor-relays] tor relay + bridge

Hi, I have a vps acc with 2 ips. I'd like to keep one free of tor, the other is tor only. Right now I run a relay - http://torstatus.blutmagie.de/router_detail.php?FP=e6277f0036890d4ff334c65e1... Is it possible to run a bridge on the same server? I assume the same ip would be a problem, but I can get practically unlimited ipv6. Can I run one on only ipv4 and the other on only ipv6? Which do you suggest for each? Regards!