Configuring Cisco Router Interfaces and Access Lists

To configure FastEthernet interfaces on a Cisco router, enter interface range mode and enable the interfaces:

Router(config)#int range f0/0 - 1
Router(config-if-range)#no shutdown

Then configure each interface with an IP address:

Router(config)#int f0/0
Router(config-if)#ip address 10.0.0.254 255.0.0.0
Router(config)#int f0/1
Router(config-if)#ip address 20.0.0.254 255.0.0.0
Router(config-if)#exit

Create a standard access list that denies traffic from host 10.0.0.1:

Router(config)#access-list 2 deny host 10.0.0.1
Router(config)#exit

Apply the access list to inbound traffic on interface f0/0 and add a permit rule for the desired network:

Router(config)#interface f0/0
Router(config-if)#ip access-group 2 in
Router(config)#access-list 2 permit 10.0.0.2 0.255.255.255

Verify the access list configuration with the show command:

Router#show access-lists
Standard IP access list 2
deny host 10.0.0.1 (8 match(es))
permit 10.0.0.0 0.255.255.255 (4 match(es))