Problemas con check_dchp

[Chris Wilson]

Hi Luis,

First of all, please always copy the list so that others can find your
question in future, and the answer to it.

Secondly, I already told you you can't run check_dhcp on the DHCP
server. It needs to run on another machine. Test that and make sure it
works, then use NRPE to run it on another machine.

Cheers, Chris.

On Wed, 2005-09-28 at 03:44, Luis Gardea wrote:
> Hi
>  
> I have a DHCP server running in windows 2003 in the subnet 20,
> and Nagios is running in other server with Fedora C ethier in the
> subnet 20, But In my fedora server I have two ethernet NIC's one in
> the subnet 20 (eth0) another in subnet 15(eth1).
>  
> I try with this options
>  
> [tlacuilo at netids libexec]# ./check_dhcp -s 147.215.20.12
> DHCP problem: No DHCPOFFERs were received
> 
> [tlacuilo at netids libexec]# ./check_dhcp -s 147.215.20.12 -r
> 147.215.20.64 
> DHCP problem: No DHCPOFFERs were received
>  
> [tlacuilo at netids libexec]# ./check_dhcp -s 147.215.20.12 -r
> 147.215.20.64 -t 10  -i eth0
> DHCP problem: No DHCPOFFERs were received
>  
> [tlacuilo at netids libexec]# ./check_dhcp -s 147.215.20.12 -r
> 147.215.20.64 -t 10  -t 10 -i eth0 -v
>  DHCP problem: No DHCPOFFERs were received
>  
> I the page the nagios.org say that: 
> 
> You can monitor DHCP services on your network by using the check_dhcp
> plugin included in the contrib/ subdirectory of the main plugin
> distribution. The plugin will probably *not* work with DHCP relays and
> older BOOTP servers, but you are welcomed to give it a try. 
> 
> While in the contrib/ subdirectory, type 'make check_dhcp' to compile
> the plugin. 
> 
> Note that the plugin *must* best installed suid root in order to run,
> as it binds to a privileged port (UDP 67) in order to listen to
> DHCPOFFER packets
> 
> 
> I installed check_dchp with root privilege and in my firewall I'll
> open the port 64:udp, but still not working. 
>  
> I'm lost, :<    
>  
>  
> On 9/27/05, Chris Wilson <chris at aidworld.org> wrote: 
>         Hi Marc and Luis,
>         
>         On Mon, 2005-09-26 at 22:57, Marc Powell wrote:
>         
>         > > From: Luis Gardea [mailto: gardealuis at gmail.com]
>         [...]
>         > > My problem is that I want to put in my nagios server the
>         server of
>         > DCHP,
>         > > But when I try monitoring I get allway the next error. 
>         > >
>         > > [tlacuilo at netids libexec]# ./check_dhcp -s netdns
>         > > DHCP problem: No DHCPOFFERs were received.
>         [...]
>         > > I don't know if the problem are the firewall or toher
>         thing.
>         > 
>         > Neither do we really. Can another machine on the same subnet
>         obtain an
>         > IP address from the DHCP server? Are you running a firewall
>         on the
>         > machine running check_dhcp that might be preventing DHCP
>         from working? 
>         > Do you see entries in your firewall logs indicating that
>         it's being
>         > blocked? Does your DHCP server specifically ignore requests
>         from that
>         > machine?
>         
>         There is an "issue" with ISC DHCPD (by design I think) which
>         makes it 
>         almost impossible to run a client on the DHCP server -
>         something to do
>         with listening on the loopback interface and the address space
>         bound to
>         that interface. I heard that others were able to make it work
>         with some 
>         black magic, but I never succeeded. The short answer is that
>         you can't
>         check DHCP from the same machine - or at least expect problems
>         if you
>         do.
>         
>         How about using check_by_ssh or check_nrpe to execute the DHCP
>         check on 
>         another machine?
>         
>         Cheers, Chris.
>         --
>         (aidworld) chris wilson | chief engineer (chris at aidworld.org)
>         
>         
>         
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-- 
(aidworld) chris wilson | chief engineer (chris at aidworld.org)



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