The problem *does* occur with non-broken DNS servers, too. I just tried
the test program "test3.c" attached to my comment from 2007-05-13 on a
system booted from a Lucid alpha3 live CD, and it still takes more than
five seconds to execute. The system was directly querying a BIND 9 DNS
server, and there was no "cheap home router" involved. This is trivial
to reproduce; please try it.

Why is Ubuntu doing mDNS lookups for reverse mappings, anyway?  I can
see the utility of doing mDNS for forward mappings, but doing mDNS for
reverse mappings seems not only harmful (being the cause of this bug),
but also quite pointless.

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mdns listed in nsswitch.conf causes excessive time  for dns lookups
https://bugs.launchpad.net/bugs/94940
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