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Is it possible for a specific interface to only allow access to specific dhcp pools? This is assuming a cisco router(IOS) with dhcp server capabilities.

E.g. For some router, hosts on fa0/0 can obtain an address from pool1 (192.168.0.0/29) via dhcp, hosts on interface fa0/1 can obtain an address from pool2 (172.16.0.0/29) via dhcp.

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1 Answer

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If you configure an IP address on an interface the router will use the corresponding DHCP pool to answer DHCP requests. In your case you would do something like this:

interface Fa0/0
 ip address 192.168.0.1 255.255.255.248
!
interface Fa0/1
 ip address 172.16.0.1 255.255.255.248
!
ip dhcp pool 0
 network 192.168.0.0 255.255.255.248
 ...
!
ip dhcp pool 1
 network 172.16.0.0 255.255.255.248
 ...
!

The interface IP on Fa0/0 is inside the network for DHCP pool 0 and the IP on Fa0/1 is inside pool 1. So hosts on Fa0/0 will get addresses from pool 0 and hosts on Fa0/1 will get addresses from pool 1.

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