Cisco Systems OL-6426-02 manual Configuring AutoSecure, Configuring Access Lists, ACL Type, 12-2

Chapter 12 Configuring Security Features

Configuring AutoSecure

For information about configuring AAA services and supported security protocols, see the following sections of the Cisco IOS Security Configuration Guide:

•Configuring Authentication

•Configuring Authorization

•Configuring Accounting

•Configuring RADIUS

•Configuring TACACS+

•Configuring Kerberos

Configuring AutoSecure

The AutoSecure feature disables common IP services that can be exploited for network attacks and enables IP services and features that can aid in the defense of a network when under attack. These IP services are all disabled and enabled simultaneously with a single command, greatly simplifying security configuration on your router. For a complete description of the AutoSecure feature, see the “AutoSecure” feature document.

Configuring Access Lists

Access lists (ACLs) permit or deny network traffic over an interface based on source IP address, destination IP address, or protocol. Access lists are configured as standard or extended. A standard access list either permits or denies passage of packets from a designated source. An extended access list allows designation of both the destination and the source, and it allows designation of individual protocols to be permitted or denied passage. An access list is a series of commands with a common tag to bind them together. The tag is either a number or a name. Table 12-1lists the commands used to configure access lists.

Table 12-1 Access List Configuration Commands

ACL Type

Numbered

Standard

Extended

Named

Configuration Commands

access-list {1-99}{permit deny} source-addr[source-mask]

access-list {100-199}{permit deny} protocol source-addr[source-mask]destination-addr[destination-mask]

Standard

Extended

ip access-list standard name followed by deny {source

source-wildcard any}

ip access-list extended name followed by {permit deny} protocol {source-addr[source-mask] any}{destination-addr[destination-mask] any}

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

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