Standard Nagios Plugins 1.4.9 and IPv6 problem?

[Mick]

On Thursday 20 September 2007, Hugo van der Kooij wrote:

> >> On Wed, 19 Sep 2007, Frost, Mark {PBG} wrote:
> >>> Hello.  We've been noticing that our Nagios host (Red Hat ES 3 release
> >>> 3) has been sending out quite a lot of IPv6 DNS requests (I guess those
> >>> are "AAAA" record requests on port 53). 
> I think that a pluging will just follow the host definition. I doubt there
> is anything you can change in the plugins to ignore IPv6 resolving if you
> use a hostname. It is something that should be part of your resolver
> library behaviour. So it should be configured there.

Some ideas:

I am not up to speed with RedHat, but if you have a /etc/hosts file or 
equivalent and the particular FQDN that you monitor has a fixed IP address 
you can make an entry there so that the server does not need to go out to a 
DNS server to resolve the address.

Failing that look at 1-4 below in order of relative complexity:

1. Issuing the appropriate sysctl command to modify a relevant ipv6 setting 
(not sure what this would be).
2. Configuring iptables to block ipv6 outgoing addresses.
3. Rebuilding nagios-plugins without the ipv6 flag.
4. Rebuilding the kernel without ipv6 support.

HTH.
-- 
Regards,
Mick
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