Hi all: I have a Cisco 2950 and I'm trying to apply a simple ACL to block pings from outside to our internal network. Here is the info on the switch: Cisco Internetwork Operating System Software IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(19)EA1c, RELEASE SOFTWARE (fc2) Copyright (c) 1986-2004 by cisco Systems, Inc. Compiled Mon 02-Feb-04 23:29 by yenanh Image text-base: 0x80010000, data-base: 0x8058A000 Here is the ACL: Extended IP access list 103 deny icmp any any echo log-input permit ip any any When I tried to apply it, it won't take: Catalyst2950-External#conf term Enter configuration commands, one per line. End with CNTL/Z. Catalyst2950-External(config)#int fa0/5 Catalyst2950-Exter(config-if)#ip access-group ? % Unrecognized command Can someone shed some light on this please? Thank you.