I have been trying to set up an Access Control List on a Cisco 1841 router. I can see that a basic ACL isnt exactly rocket science, but this just doesn't seem to work. By "doesn't work" I mean that as soon as I apply the ACL to an interface, i immediately lose all IP connectivity to the 192.168.240.0 network. Please see http://www.geocities.com/muzikan/basicdiagram.gif for a view of the basic network structure. I need to set up the router at 10.1.1.3 so that it will only permit traffic to enter from the 192.168.242.0 subnet. I have tried to account for both the internal and external interfaces of the source network. All subnet masks are /24. The access control list entries look as follows:
access-list 1 permit 192.168.242.0 0.0.0.255
access-list 1 permit 10.1.1.0 0.0.0.255
Surely there is something ridiculously easy I am overlooking here.