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Global Configuration Mode Command Set Command Reference Guide

ip access-list extended <listname>

Use the ip access-list extended command to create an empty access list and enter the extended access-list

command set. Use the no form of this command to delete an access list and all the entries contained in it.

The following lists the complete syntax for the ip access-list extended commands:

Syntax Description

Alphanumeric descriptor for identifying the configured access list (all access list

descriptors are case-sensitive)

Specifies the data protocol such as ip, icmp, tcp, udp, or a specific protocol

(0-255)

Specifies the source IP address used for packet matching

IP addresses can be expressed in one of three ways:

1. Using the keyword

any

to match any IP address. For example, entering

deny

any

will effectively shut down the interface that uses the access list because all

traffic will match the

any

keyword.

2. Using the

host

<A.B.C.D> to specify a single host address. For example,

entering

permit 196.173.22.253

will allow all traffic from the host with an IP

address of 196.173.22.253.

3. Using the <A.B.C.D> <wildcard> format to match all IP addresses in a “range”.

Wildcard masks work in reverse logic from subnet mask. Specifying a one in the

wildcard mask equates to a “don’t care”. For example, entering

deny 192.168.0.0

0.0.0.255

will deny all traffic from the 192.168.0.0/24 network.

Example:

<source port>* [ any | host <A.B.C.D> | <A.B.C.D> <W.W.W.W> ] <destination port>*

Example:

[ permit | deny ] icmp [ any | host <A.B.C.D> | <A.B.C.D> <W.W.W.W> ]

[ any | host <A.B.C.D> | <A.B.C.D> <W.W.W.W> ] <icmp-type>* <icmp-code>* <icmp-message>*

* = optional

Source IP Address

Destination IP

Source IP Address

Destination IP

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