Working on subnet different from DHCP server subnet

Lyle Giese lyle at lcrcomputer.net
Sun Apr 23 01:16:59 UTC 2006


Jacques VUVANT wrote:
> Hi
>  
>  I've tried to configure my dhcp server as explain on many howto, but it still not work. Here are configurations:
>  
>  - dhcp server IP address: 202.87.129.66/27
>  - pool I want to allow : 202.87.145.2 to 202.87.145.5
>  
>  dhcpd.conf
>  =========
>  option domain-name "test.com";
>  option domain-name-servers 202.87.129.35, 202.87.129.34;
>  option routers 202.87.129.65;
>  ddns-update-style none;
>  default-lease-time 14400;
>  subnet 202.87.145.0 netmask 255.255.255.224 {
>    range 202.87.145.2 202.87.145.5;
>    default-lease-time 14400;
>    max-lease-time 172800;
>  }
>  subnet 202.87.129.64 netmask 255.255.255.224 {
>  }
>  
>  With this configuration, I have following message on debug
>  
>  admin:~ # dhcpd -d -f
>  Internet Systems Consortium DHCP Server V3.0.4rc1
>  Copyright 2004-2005 Internet Systems Consortium.
>  All rights reserved.
>  For info, please visit http://www.isc.org/sw/dhcp/
>  Wrote 0 leases to leases file.
>  Listening on LPF/eth0/00:11:d8:e6:01:52/202.87.129.64/27
>  Sending on   LPF/eth0/00:11:d8:e6:01:52/202.87.129.64/27
>  Sending on   Socket/fallback/fallback-net
>  DHCPDISCOVER from 00:0d:5e:dc:3b:2c via eth0: network 202.87.129.64/27: no free leases
>  DHCPDISCOVER from 00:0d:5e:dc:3b:2c via eth0: network 202.87.129.64/27: no free leases
>  DHCPDISCOVER from 00:0d:5e:dc:3b:2c via eth0: network 202.87.129.64/27: no free leases
>  
> This configuration should be work. So someone can help me ?
>  
>  Thanks
>  
>  Jacques VUVANT
>  
> 		
> ---------------------------------
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> 
> 
If your DHCP server is not on the same subnet as the clients you want to 
serve, you need a 'helper' to tell the DHCP server that some one from 
subnet 202.87.145.0 wants an IP address.

In your case, the server is hearing a broadcast directly from a client 
and assumes it needs an IP address from the same subnet as the server is 
on.  And that is exactly what the message is telling you, I don't have 
any availible address on this subnet.

Lyle


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