1 DHCP Server - 1 interface serving multiple subnets

Simon Hobson dhcp1 at thehobsons.co.uk
Sat May 24 07:19:11 UTC 2008

Nate Beck wrote:

>   I have a dhcpd 4.0.0 server with an interface that I 
>need to serve up address's to many subnets some /24 and some /23's 
>all in 10.61.x.x.  I have the server configured, and have set the 
>cisco router with an ip helper-address for the subnets that sends 
>all traffic to but I am not getting any ip's at all from 
>the server.  Is there a secret to setting up a single server to 
>serve multiple subnets?

No secret - just define the subnets (note: this is NOT a 
shared-subnet) and configure helpers in each router.

If it isn't working you need to do some troubleshooting :

1) Look in the server logs, is the server getting any requests

2) Look in the server logs, is it giving out any offers or logging 
any reasons not to ?

3) Start sniffing traffic on the wire (I use Wireshark) to see if 
there is any DHCP traffic. You need to do this both on a client 
network and on the server network for the full picture.

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