[Nagiosplug-devel] feature request -selecting yournetwork interface

Thomas Guyot-Sionnest Thomas at zango.com
Fri Sep 29 20:47:05 CEST 2006

Only thing here is that I'm not what you can call a C programmer at all. I
do some Perl, I learned the basis of C some time ago... The hack for
check_ping was trivial as I only redirected an argument to another program.
And even for that simple hack I managed to segfault before getting it right
(I was checking for valid IP address though).

If you really insist and encourage me I'll try it :) But for now I don't
even have an idea how to set the source IP on a socket...


> -----Original Message-----
> From: nagiosplug-devel-bounces at lists.sourceforge.net 
> [mailto:nagiosplug-devel-bounces at lists.sourceforge.net] On 
> Behalf Of Andreas Ericsson
> Sent: September 29, 2006 11:30
> To: Nagios Plugin Development Mailing List
> Subject: Re: [Nagiosplug-devel] feature request -selecting 
> yournetwork interface
> Thomas Guyot-Sionnest wrote:
> > 
> > Using Linux VLAN support I'd like to be able to have one IP 
> per VLAN and
> > check all interconectivity between vlans and other sites. 
> So for example I
> > may want to know if hosts in the .7 vlan can connect to the 
> mail server in
> > the .4 vlan, but since I have an IP in the .4 vlan already 
> it won't go
> > trough the firewall. So I must specify to sent it from the .7 vlan.
> > 
> Ah. This makes your request make sense. If you wish for the outbound 
> traffic to go through a specific interface, that's very easy 
> to fix. You 
> just need to bind(2) the socket to an IP specified by the 
> user prior to 
> calling connect(2) on it. The IP ofcourse have to exist and be 
> associated with the interface you want to use for the 
> outbound traffic.
> Provided you don't have two interfaces with the same IP (which would 
> indeed be completely insane), this will work magnificently while 
> avoiding the portability problems associated with finding a specific 
> interface (have a look at check_dhcp for some true 
> portability horror).
> Happy hacking, and make sure you send in the patch when you're done.
> -- 
> Andreas Ericsson                   andreas.ericsson at op5.se
> OP5 AB                             www.op5.se
> Tel: +46 8-230225                  Fax: +46 8-230231
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