On Mon, 2011-04-04 at 09:51 -0500, Russell Jones wrote:
> Hello!
> I am having a strange issue with CentOS 5.4 that I cannot seem to solve.
> Every DNS lookup results in AAAA records being requested first before A
> records. As a result, this causes a large amount of unnecessary DNS
> traffic on the network. IPv6 has been completely disabled on these servers:
Doubtful, if you are seeing AAAA lookups. Does "ip addr" show any IPv6
interfaces?
> /etc/modprobe.conf, ipv6 off and net-pf-10 off
> /etc/sysconfig/network, NETWORKING_IPV6=no
> lsmod | grep ipv6 shows the kernel module no longer loaded.
> Yet watching TCP dump shows that AAAA records are requested before A
> records every time a login is requested from one of our local machines
> to another
You *only* sees these for login? Perhaps some authentication module you
are using is causing them to happen?
> Is there some sort of configuration directive I can use to
> force IPv4 lookups first before IPv6? Or even better, stop IPv6 lookups
> all together?
I don't believe you see IPv6 lookups from the normal resolver libraries
unless there is at least one active IPv6 interface.
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