Chapter_05_4

Standard ACLs

Standard ACLs allow you to permit or deny traffic from source IP addresses. The destination of the packet and the ports involved do not matter. The example allows all traffic from network 192.168.30.0/24 network. Because of the implied "deny any" at the end, all other traffic is blocked with this ACL. Standard ACLs are created in global configuration mode.

Extended ACLs

Extended ACLs filter IP packets based on several attributes, for example, protocol type, source and destination IP address, destination IP address, source TCP or UDP ports, destination TCP or UDP ports, and optional protocol type information for finer granularity of control. In the figure, ACL 103 permits traffic originating from any address on the 192.168.30.0/24 network to any destination host port 80 (HTTP). Extended ACLs are created in global configuration mode.