Enable ExtORPort by default when PTs are used?
When we merged the Extended ORPort to tor.git (#4773 (moved) and #5040 (moved)), I wrote a post to tor-relays asking people to upgrade to git master so that they can get statistics with their bridge (https://lists.torproject.org/pipermail/tor-relays/2013-August/002477.html).
Unfortunately, I forgot to ask people to enable the Extended ORPort in their torrc, so their Tor just opens an ORPort and all their obfsproxy traffic goes through there.
Currently, the Extended ORPort can be enabled by adding ExtORPort 6669 to your torrc.
This is OK for now, but maybe we could make Tor smarter and make it open an Extended ORPort if it has an ORPort && there is a ServerTransportPlugin present in its torrc.
(With the above logic, if the bridge has a ServerTransportPlugin but with an older obfsproxy that doesn't support the Extended ORPort, then the ExtORPort will be left unused. That shouldn't be a big problem since the Extended ORPort is only bound on localhost.)