Reference Guide

80 | Access Control Lists (ACLs)
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To configure a filter for an extended IP ACL without a specified sequence number, use any or all of the
following commands in IP ACCESS LIST mode:
Figure 5-11 shows an extended IP ACL in which the sequence numbers were assigned by the software.
The filters were assigned sequence numbers based on the order in which they were configured (for
example, the first filter was given the lowest sequence number). The show config command in IP ACCESS
LIST mode displays the two filters with the sequence numbers 5 and 10.
Figure 5-11. Extended IP ACL
To view all configured IP ACLs and the number of packets processed through the ACL, use the show ip
accounting access-list
command in EXEC Privilege mode (Figure 5-6).
Established Flag
To obtain the functionality of est, use the following ACLs:
• permit tcp any any rst
• permit tcp any any ack
Command Syntax Command Mode Purpose
{deny | permit} {source mask | any | host
ip-address} [count [byte]] [order] [fragments]
CONFIG-EXT-NACL Configure a deny or permit filter to
examine IP packets.
{deny | permit} tcp {source mask] | any | host
ip-address}} [count [byte]] [order] [fragments]
CONFIG-EXT-NACL Configure a deny or permit filter to
examine TCP packets.
{deny | permit} udp {source mask | any | host
ip-address}} [count [byte]] [order] [fragments]
CONFIG-EXT-NACL Configure a deny or permit filter to
examine UDP packets.
FTOS(conf-ext-nacl)#deny tcp host 123.55.34.0 any
FTOS(conf-ext-nacl)#permit udp 154.44.123.34 0.0.255.255 host 34.6.0.0
FTOS(conf-ext-nacl)#show config
!
ip access-list extended nimule
seq 5 deny tcp host 123.55.34.0 any
seq 10 permit udp 154.44.0.0 0.0.255.255 host 34.6.0.0
FTOS(conf-ext-nacl)#