Hello Cisco support community,
I have a question regarding ACL with DHCP:
I have cisco 881 routers:
- VLAN 1 (FastEthernet 0, 1, 2 and 3): IP address 172.20.0.1/16
- FastEthernet 4 (connected to another network): IP address receivede from a DHCP server.
These router will be installed on different sites where I don't have access to the DHCP server: I don't know the IP address that FA4 will receive.
I want to make an inbound ACL to allow access to 1 host in the FA4 network to a specific port.
interface fa 4
ip access-group FILTER in
ip access-list FILTER
permit tcp host [host IP] [IP FA4] eq [port]
How can I do that kind of ACL if I don't know the IP address of FA4 in advance ?
Thank you !