On 04/11/2011 09:48 AM, Neil Wilson wrote: Interesting. Because my main development machine is still running radvd 1.6, I hadn't been aware of those options. There aren't any examples in the manpage. Do you have a working example? We do that for qemu, but currently not for anything else that I'm aware of. Fortunately, "radvd -v" seems to reliably print out "Version x.x" on the first line (at least for 1.6 and 1.7), so we could possibly put similar logic in place for radvd, adding in DNS support when available. Of course we would want to make sure it was obvious to the admin when IPV6 DNS autconfig support wasn't available due to an old radvd (without cluttering the logs too much), otherwise we would run the risk of a lot of "bug" reports due to the radvd version being too old. Not at the moment. It does sound very useful though. It would be really nice if IPv6-only worked properly. If you're not in a patch-writing mood, I could work something up, assuming someone provides a working radvd.conf file (keep in mind that we already have dnsmasq listening for DNS requests on the IPv6 address of the bridge; we just need autoconf to tell the guest to use it).