I have two subnets and a Cisco 2600 switch. I want to install a DHCP server on each subnet and use the switch to block DHCP requests getting from one subnet to the other.

How can I do this on the 2600? It only has two fast Ethernet interfaces configured.

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When a DHCP client sends a request the server -- the server will respond to the one that has a better priority. So you can set priorities so that for one subnet only one server will respond. If you are configuring your router as DHCP server than you need to configure two different DHCP pools and block addresses using Mac address. You can also set priority. You can use access-lists also to block.

Also what I think is you might not need two servers. You may only need to have one server with two scopes and use helper address on the other subnet.

This was first published in August 2003

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