Regarding Microsoft suggesting in their documentation to use .local as
the tld for an Active Directory domain, that's just an example, not
really a suggestion, as in "you might want to use a name such as
"mycompany.local".  This was back before the major problems with the
.local TLD and Bonjour/Rendezvous/zeroconf hit the fan, and the link
Aaron C. de Bruyn gave in 2007 is to one document, from 2003, that had
that unfortunate example.

More recently, since 2004 actually, Microsoft has acknowledged the
proposed reservation of .local as the TLD for mDNS search, and strongly
recommend against using .local for your AD domain TLD.  Further, they
now recommend against using any other "illegal" TLD, because, as with
.local, you never know when that TLD will suddenly become legit, causing
you all sorts of havoc, like those Microsoft victims, er, users that
were unfortunate enough to take the earlier example as gospel.

Microsoft now recommends that you use a "private" subdomain of your
company's registered domain, like "corp.mycompany.com" or
"lan.mycompany.org" or whatever, where the TLD/registered domain is
mycompany.com or mycompany.org, respectively.  Again, those are
examples, and not gospel...

As to this issue with avahi, it's still an issue if you are in that
group that still uses .local as your AD TLD.  What I did to work around
it was to put "dns" in front of "mdns4_minimal" in the hosts: line of
nsswitch.conf.  There's still a lag, but it at least resolves by fqdn
now, letting me join the Linux box to the AD domain, without removing
avahi.

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https://bugs.launchpad.net/bugs/94940

Title:
  mdns listed in nsswitch.conf causes excessive time  for dns lookups

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