Quoting Dionysios K. via tor-relays (2024-11-28 11:49:19)

Is there any particular configuration change I have to do in torrc/nginx for my bridge to be listed as both v4/v6 on the metrics website?

The metrics website only displays the reachability of the ORport, so it doesn't really represent if webtunnel is reachable over v4/v6. Will be nice to improve, but we can't do it now.

If your website does support both IPv4 and IPv6 webtunnel clients will use both automatically, so they will use IPv6 if they are in an IPv6 network and IPv4 otherwise. Webtunnel clients do resolve the DNS of your website and will use the IP they get from it.

It's a webtunnel bridge and that complicates things, for obfs4 the configuration is pretty much straightforward.

You are right, webtunnel bridges are a bit more complicated to set up. Sorry.