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Re: Weird resolver problem in Debian 8

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On Tue, 25 Jul 2017, Torbjorn Pettersson wrote:
> Same result regardless of how many times I run it. Great,
> but telnet, however, chooses one of the a records at "random".

DNS sortlist works mostly for apps using outdated APIs.  telnet in
stretch has long moved to the new APIs that are IPv6-enabled properly,
and therefore they will use *all* A and AAAA records returned from the
DNS lookup (so *dns* sort order doesn't matter since it will consider
every result regardless of the order) and select which ones to try first
based on several hardcoded rules *and* (in glibc's case) local
configuration related to IPv6+IPv4 source address selection.

Please configure your network preference ordering in /etc/gai.conf, and
it should work for the majority of the stuff in Debian.  In fact, you
can even configure ipv4 ranges (or all of it) to be prefered over some
ipv6 ranges (or all of it), etc.

-- 
  Henrique Holschuh

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Thread

Weird resolver problem in Debian 8 Torbjorn Pettersson <tobbe@strul.nu> - 2017-07-25 16:40 +0200
  Re: Weird resolver problem in Debian 8 Torbjorn Pettersson <tobbe@strul.nu> - 2017-07-25 16:50 +0200
  Re: Weird resolver problem in Debian 8 Henrique de Moraes Holschuh <hmh@debian.org> - 2017-07-25 17:50 +0200
    Re: Weird resolver problem in Debian 8 Torbjörn Pettersson <tobbe@strul.nu> - 2017-07-25 19:30 +0200

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