Searching the archives of this list for "IPv6" I found I was not
the only one with problems like "local domains always resolved
through dialup interface", "unable to disable IPv6 for some
reason", "DNS madness on Woody", and other problems with "local
address lookup".
With the help of the IPv6 developer list I finally found the real
solution: Woody versions of some Debian packages, like telnet,
and, it seems, exim, *require* IPv6 addresses for your local
machines (including localhost!) in /etc/hosts, or they will call
your ISP to ask for them. And of course your ISP's nameservers
don't have them either. Specifying local lookup ("files") in
/etc/nsswitch.conf does not help.
So if your /etc/hosts is, for instance:
127.0.0.1 localhost
192.168.1.1 mars.my.home mars
192.168.1.2 jupiter.my.home jupiter
192.168.1.3 venus.my.home venus
Then at the end of the file you have to add
::FFFF:127.0.0.1 localhost
::FFFF:192.168.1.1 mars.my.home mars
::FFFF:192.168.1.2 jupiter.my.home jupiter
::FFFF:192.168.1.3 venus.my.home venus
The stuff already added to /etc/hosts by the Woody upgrade
process, like
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
etc., should remain where it is.
I have no idea why this new behaviour of the packages should be a
Good Thing (a ploy to harass ISP's, to force them to support IPv6,
perhaps?), but at least I have now restored some sanity to my
system.
Regards, Jan
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