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Command Reference Guide Global Configuration Mode Command Set

<icmp-code>

*Optional

ICMP packets that are filtered using the ICMP message type (using the

<icmp-type> keyword) may also be filtered using the ICMP message code (valid

range: 0 to 255).

An <icmp-type> must be specified when entering an <icmp-code>.

<icmp-message>

*Optional

Filter packets using ICMP descriptive message rather than the corresponding

type and code associations.

Default Values

By default, all ADTRAN OS security features are disabled and there are no configured access lists.

Command Modes

(config)# Global Configuration Mode

Command History

Release 2.1 Command was introduced

Functional Notes

Access control lists (ACLs) are used as packet selectors by other ADTRAN OS systems; by themselves they

do nothing. ACLs are composed of an ordered list of entries with an implicit

deny all

at the end of each list. An

ACL entry contains two parts: an action (permit or deny) and a packet pattern. A permit ACL is used to allow

packets (meeting the specified pattern) to enter the router system. A deny ACL is used to block entry to the

network for specified criteria. The ADTRAN OS provides two types of ACLs: standard and extended. Standard

ACLs allow source IP address packet patterns only. Extended ACLs may specify patterns using most fields in

the IP header and the TCP or UDP header.

ACLs are performed in order from the top of the list down. Generally, the most specific entries should be at the

top and the most general at the bottom.

The following commands are contained in the access-list extended command set:

remark

Use the remark command to associate a descriptive tag (up to 80 alphanumeric characters encased

in quotation marks) to the access-list. Enter a functional description for the list such as “This list

blocks all outbound web traffic”.

log

Using the log keyword logs a message (if debug access-list is enabled for this access list) when the

access list finds a packet match.

Syntax Description (Continued)

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