Using CentOS 6.9 with IPv4 configured, and _not_ disabling IPv6 yet, we
want this NFS client system to prefer the IPv4 address of a dual-stack
remote NFS server, which has both A and AAAA records in DNS.
Otherwise we get a minutes long pause while automounter tries to mount
the IPv6 address -- I can see automounter's '/bin/mount' running, using
the AAAA record of the server, until that times-out and the IPv4 address
of the server mounts successfully.
Disabling IPv6 altogether works around the problem as expected, but is
a bigger hammer than we wanted to use. :-)
I found posts from others in a similar situation, and proposed solutions
included modifying /etc/gai.conf to use:
precedence ::ffff:0:0/96 100
I cp'd /usr/share/doc/glibc-common-2.12/gai.conf to /etc/ and tried that,
with several other permutations (e.g. uncommenting other blocks of "label"
and "precedence" settings) but none achieved the desired effect.
Am I misunderstanding how this is supposed to work?
Cheers,
sr.
--
|| Steve Rikli ||| Well, we've stared at it... that oughta ||
|| Systems Administrator ||| fix it! Let's get outta here. ||
|| Genyosha Networks ||| ||
|| sr@xxxxxxxxxxxx ||| - Crow, MST3K ||
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