To view all configured IP ACLs, use the show ip accounting access-list command in EXEC Privilege mode.The following examples shows how to view a standard ACL filter sequence for an interface.Dell#show ip accounting access example interface gig 4/12Extended IP access list exampleseq 15 deny udp any any eq 111seq 20 deny udp any any eq 2049seq 25 deny udp any any eq 31337seq 30 deny tcp any any range 12345 12346seq 35 permit udp host 10.21.126.225 10.4.5.0 /28 monitor 300seq 40 permit udp host 10.21.126.226 10.4.5.0 /28seq 45 permit udp 10.8.0.0 /16 10.50.188.118 /31 range 1812 1813seq 50 permit tcp 10.8.0.0 /16 10.50.188.118 /31 eq 49 monitor 349seq 55 permit udp 10.15.1.0 /24 10.50.188.118 /31 range 1812 1813To delete a filter, enter the show config command in IP ACCESS LIST mode and locate the sequence number of the filter you want todelete. Then use the no seq sequence-number command in IP ACCESS LIST mode.Configure an Extended IP ACLExtended IP ACLs filter on source and destination IP addresses, IP host addresses, TCP addresses, TCP host addresses, UDP addresses,and UDP host addresses.The traffic passes through the filter in the order of the filter’s sequence and hence you can configure the extended IP ACL by first enteringIP ACCESS LIST mode, and then assigning a sequence number to the filter.Configuring Filters with a Sequence NumberTo configure filters with a sequence number, use the following commands.1 Enter IP ACCESS LIST mode by creating an extended IP ACL.CONFIGURATION modeip access-list extended access-list-name2 Configure a drop or forward filter.CONFIG-EXT-NACL modeseq sequence-number {deny | permit} {ip-protocol-number | icmp | ip | tcp | udp} {source mask| any | host ip-address} {destination mask | any | host ip-address} [operator [portnumber ][count [byte]] [order] [monitor [session-id]] [fragments]When you use the log keyword, the CP logs details about the packets that match. Depending on how many packets match the log entryand at what rate, the CP may become busy as it has to log these packets’ details.Configure Filters, TCP PacketsTo create a filter for TCP packets with a specified sequence number, use the following commands.1 Create an extended IP ACL and assign it a unique name.CONFIGURATION modeip access-list extended access-list-name2 Configure an extended IP ACL filter for TCP packets.CONFIG-EXT-NACL modeAccess Control Lists (ACLs) 123
