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There's no boring words in hacker's life.
New day = new things. Don't be a lazy fools!

Using a Single DHCP Server to Serve Multiple Networks

As stated before, DHCP clients send their requests for IP addresses to a broadcast address which is limited to the local LAN. This would imply that a DHCP server is required on each subnet. Not so. It is possible to configure routers to forward DHCP requests to a DHCP server many hops away. This is done by inserting the IP address of the router's interface on the DHCP client's network into the forwarded packet. To the DHCP server, the non-blank router IP address field takes precedence over the broadcast address and it uses this value to provide a DHCP address that is meaningful to the client. The DHCP server replies with a broadcast packet, and the router, which has kept track of the initial forwarded request, forwards it back towards the client. You can configure this feature on Cisco devices by using the ip helper-address command on all the interfaces on which DHCP clients reside. Here is a configuration sample that points to a DHCP server with the IP address 192.168.36.25:
interface FastEthernet 2/1
 ip address 192.168.1.30 255.255.255.0
 ip helper-address 192.168.36.25
That's all. Taken from linuxhomenetworking.com

This entry was posted on Wednesday, April 05, 2006 at 6:02 PM. You can skip to the end and leave a response.

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