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Add an option to add 'option=single-request' to /etc/resolv.conf.

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This commit is contained in:
Jack Cummings 2012-10-21 21:46:05 -07:00
parent d1bafd9e7f
commit 1cbad692c3
1 changed files with 15 additions and 0 deletions
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15
modules/config/networking.nix
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@ -16,6 +16,18 @@ let
'';
};
networking.dnsSingleRequest = pkgs.lib.mkOption {
default = false;
description = ''
Recent versions of glibc will issue both ipv4 (A) and ipv6 (AAAA)
address queries at the same time, from the same port. Sometimes upstream
routers will systemically drop the ipv4 queries. The symptom of this problem is
that 'getent hosts example.com' only returns ipv6 (or perhaps only ipv4) addresses. The
workaround for this is to specify the option 'single-request' in
/etc/resolve.conf. This option enables that.
'';
};
};
in
@ -60,6 +72,9 @@ in
# Invalidate the nscd cache whenever resolv.conf is
# regenerated.
libc_restart='${pkgs.upstart}/sbin/start invalidate-nscd'
'' + optionalString cfg.dnsSingleRequest ''
# only send one DNS request at a time
resolv_conf_options='single-request'
'' + optionalString config.services.bind.enable ''
# This hosts runs a full-blown DNS resolver.
name_servers='127.0.0.1'