Comment 32 for bug 308181

I have worked with SRV records before (they're used in SIP networks, see
RFC3263), and I can tell you that multiple round-trip is not an issue at all.
SRV and A records will be returned in 1 packet, if there's enough room (that's
where RFC2671 comes in handy).

Note that 127.0.0.1/8 was originally a routable network. I still have customers
that use them, both on private networks and as 'internal' addresses (only
routable in 1 host). But it becomes harder and harder to use them, because lots
of routers and IP-stacks are now hardcoding them (due to RFC3330).