Standard Nagios Plugins 1.4.9 and IPv6 problem?

[Frost, Mark {PBG}]

Another team here manages IPs/DNS so we're not looking to hardcode IPs
for hundreds of hosts we don't manage and won't be aware of IP changes
for.

The thing about #3 is that it seems that no matter how compile the
plugins, it will still use IPv6 if it detects that your include files
support AF_INET6.  You can't turn it off short of finding some way to
turn it off in your OS which seems a bit extreme to me.  I've always
accepted that on any flavor of Linux I use, IPv6 is available even if
I'm not using it.  The idea that some application is going to start
using it when I have no configured interface or any other indication
that IPv6 is in use baffles me.  Beyond that that these plugins would
opt to generate an extra say 4x network traffic that I can explicitly
tell them not to also baffles me.  I mean, what do I have to do to
convince 'check_nt' that no, I really really really don't want it
sending out IPv6 traffic?

I've manually change the config.h for nagios-plugins to undefine both
"HAVE_IPV6" and "USE_IPV6" and found it makes no difference.

We're looking to changes the modules file for this box to prevent any
component of IPv6 being loaded, but I'm still not convinced that will
dissuade the plugins from going on their merry way.

Thanks for everyone's replies, by the way!

Mark

-----Original Message-----
From: nagios-users-bounces at lists.sourceforge.net
[mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of Mick
Sent: Thursday, September 20, 2007 1:15 PM
To: Nagios Users mailinglist
Subject: Re: [Nagios-users] Standard Nagios Plugins 1.4.9 and IPv6
problem?

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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