ip access list features roadmap

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IP Access List Features Roadmap

First Published: August 18, 2006

Last Updated: August 18, 2006

This roadmap lists the access list features documented in the Cisco IOS Security Configuration Guide

and maps them to the modules in which they appear.

Feature and Release Support

Table 1 lists access list feature support for the Cisco IOS software releases 12.2S, 12.3T, and 12.4T.

Only features that were introduced or modified in Cisco IOS Release 12.2(1) or a later release appear in

the table. Not all features may be supported in your Cisco IOS software release.

Use Cisco Feature Navigator to find information about platform support and software image support.

Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images

support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to

http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a givenCisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS

software release train also support that feature.

Table 1 Supported Access List Features

Release Feature Name Feature Description Where Documented

Cisco IOS Releases 12.2S, 12.3T, and 12.4T

12.3(4)T

12.2(25)S

ACL Support for Filtering

IP Options

This feature allows you to filter packets

having IP Options, in order to prevent routers

from becoming saturated with spurious

packets.

Creating an IP Access List to Filter

IP Options, TCP Flags,

Noncontiguous Ports, or TTL Values

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12.3(4)T

12.2(25)S

ACL TCP Flags Filtering This feature provides a flexible mechanism

for filtering on TCP flags. Before Cisco IOS

Release 12.3(4)T, an incoming packet wasmatched as long as any TCP flag in the packet

matched a flag specified in the access control

entry (ACE). This behavior allows for a

security loophole, because packets with all

flags set could get past the access control list

(ACL). The ACL TCP Flags Filtering feature

allows you to select any combination of flags

on which to filter. The ability to match on a

flag set and on a flag not set gives you a

greater degree of control for filtering on TCP

flags, thus enhancing security.




12.3(7)T

12.2(25)S

ACLNamed ACL

Support forNoncontiguous Ports on

an Access Control Entry

This feature allows you to specify

noncontiguous ports in a single access controlentry, which greatly reduces the number of

entries required in an access control list when

several entries have the same source address,

destination address, and protocol, but differ

only in the ports.


IP Options, TCP Flags,Noncontiguous Ports, or TTL Values

12.4(2)T ACL Support for Filtering

on TTL Value

You may use extended IP access lists (named

or numbered) to filter packets based on their

time-to-live (TTL) value, from 0 to 255. This

filtering enhances your control over which

packets reach a router.




12.4(6)T ACL Manageability The ACL Manageability feature enables users

to display and clear Access Control Entry(ACE) statistics per interface and per

incoming or outgoing traffic direction for

access control lists (ACLs).

Displaying and Clearing IP Access

List Data Using ACL Manageability

Table 1 Supported Access List Features (continued)

Release Feature Name Feature Description Where Documented

ip access list features roadmap

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