ip 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 port [port]] [count [byte]] [order] [fragments]When you use the log keyword, the CP logs details about the packets that match. Depending on how manypackets match the log entry and 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 modeseq sequence-number {deny | permit} tcp {source mask | any | host ip-address}}[count [byte]] [order] [fragments]Configure Filters, UDP PacketsTo create a filter for UDP 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 UDP packets.CONFIG-EXT-NACL modeseq sequence-number {deny | permit} tcp {source mask | any | host ip-address}}[count [byte]] [order] [fragments]Example of the seq CommandWhen you create the filters with a specific sequence number, you can create the filters in any order and thefilters are placed in the correct order.NOTE: When assigning sequence numbers to filters, you may have to insert a new filter. To preventreconfiguring multiple filters, assign sequence numbers in multiples of five or another number.The example below shows how the seq command orders the filters according to the sequence numberassigned. In the example, filter 15 was configured before filter 5, but the show config command displays thefilters in the correct order.Dell(config-ext-nacl)#seq 15 deny ip host 112.45.0.0 any logDell(config-ext-nacl)#seq 5 permit tcp 12.1.3.45 0.0.255.255 anyAccess Control Lists (ACLs) 139
