a single subnet that is failing

[Glenn Satchell]

I'd look for a possible syntax error in the subnet or part of
dhcpd.conf prior to the definition of the 10.4.51.0 subnet. The parsing
of bad dhcpd.conf files is not as robust as it possibly could be.

Also version 3.0.1 is very old (released July 2004), perhaps an
upgraded version (3.0.6 and 3.1.0 are both current) might parse your
file better?

The "correct?" way to restart the service is with

  service dhcpd restart

but others have already pointed this out.

regards,
-glenn

>From: "Aaron S. Thompson" <athompson at mac.com>
>To: dhcp-users at isc.org
>Subject: a single subnet that is failing
>Date: Mon, 26 Nov 2007 12:18:15 -0500
>
> Hi All,
> 
> I have a single subnet that is failing and I could use a little  
> assistance on finding out why. I have a couple hundred subnets that  
> are working fine with 18,132 leases. Below is some key information on  
> my setup.
> 
> My routers are properly relaying the udp broadcast and the dhcp box is  
> seeing the request but hasn't matched it to the declaration. What  
> other trouble shooting techniques I'm I missing?
> 
> Linux Version
> 
> [root at ns2 init.d]# uname -a
> Linux ns2.berklee.net 2.6.9-55.EL #1 Fri Apr 20 16:35:59 EDT 2007 i686  
> i686 i386 GNU/Linux
> 
> Two error's on start up. (I do have this config (DHCPDARGS=eth0) in / 
> etc/sysconfig/dhcpd)
> 
> [root at ns2 init.d]# dhcpd restart
> Internet Systems Consortium DHCP Server V3.0.1
> Copyright 2004 Internet Systems Consortium.
> All rights reserved.
> For info, please visit http://www.isc.org/sw/dhcp/
> Wrote 0 deleted host decls to leases file.
> Wrote 0 new dynamic host decls to leases file.
> Wrote 18132 leases to leases file.
> 
> No subnet declaration for restart (0.0.0.0).
> ** Ignoring requests on restart.  If this is not what
>     you want, please write a subnet declaration
>     in your dhcpd.conf file for the network segment
>     to which interface restart is attached. **
> 
> Not configured to listen on any interfaces!
> 
> 10.4.51.0 is NOT working and 10.4.54.0 is working.
> 
>    }
> }
> subnet 10.4.51.0 netmask 255.255.255.0 {
>    #  Web Group
>    option subnet-mask 255.255.255.0;
>    option broadcast-address 10.4.51.255;
>    option routers 10.4.51.1;
> 	pool {
> 	deny dynamic bootp clients;
>     	range 10.4.51.30 10.4.51.254;
>    }
> }
> subnet 10.4.54.0 netmask 255.255.255.0 {
>    #4th Floor HR
>    option subnet-mask 255.255.255.0;
>    option broadcast-address 10.4.54.255;
>    option routers 10.4.54.1;
> 	pool {
> 	deny dynamic bootp clients;
>     	range 10.4.54.30 10.4.54.254;
>    }
> }
> 
> Log Error's
> 
> Nov 26 11:43:27 ns2 dhcpd: DHCPDISCOVER from 00:03:93:43:58:f0 via  
> 10.4.51.3: unknown network segment
> Nov 26 11:43:27 ns2 dhcpd: DHCPDISCOVER from 00:03:93:43:58:f0 via  
> 10.4.51.2: unknown network segment
> Nov 26 11:43:28 ns2 dhcpd: DHCPDISCOVER from 00:03:93:8a:5d:70 via  
> 10.4.51.2: unknown network segment
> Nov 26 11:43:28 ns2 dhcpd: DHCPDISCOVER from 00:03:93:8a:5d:70 via  
> 10.4.51.3: unknown network segment
> 
> Thanks for taking the time!
> 
> Aaron