IP access lists provide many benefits for securing a network and
achieving nonsecurity goals, such as determining quality of service (QoS)
factors or limiting
debug command output. This module describes how
to create standard, extended, named, and numbered IP access lists. An access
list can be referenced by a name or a number. Standard access lists filter on
only the source address in IP packets. Extended access lists can filter on
source address, destination address, and other fields in an IP packet.
After you create an access list, you must apply it to something in
order for it to have any effect. This module describes how to apply an access
list to an interface. However, there are many other uses for access lists,
which are mentioned in this module and described in other modules and in other
configuration guides for various technologies.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats,
see the release notes for your platform and software release. To find information about the features documented in this module,
and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this
document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature
Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.