There is now a test OpenArena master server running, with both IPv4 and IPv6 connectivity support.
See more details at: http://openarena.ws/board/index.php?topic=2260.msg39556#msg39556
There are only a couple of servers on it now, so if you run one, consider making it advertise on this dpmaster as well in addition to the main one.
A small dpmaster patch was needed to make this work:
http://openarena.ws/board/index.php?topic=4243.msg39557#msg39557
I run a ioquake3 IPv6 server, is OpenArena == ioquake3 or is it a different beast altogether?