Cisco CISCO876-SEC-I-K9 Configuration Guide - Page 116

Configuring AutoSecure, Configuring Access Lists

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Configuring AutoSecure Chapter 12 Configuring Security Features 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 12-1 lists the commands used to configure access lists. Table 12-1 Access List Configuration Commands ACL Type Numbered Standard Extended Named Standard Extended 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] 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} 12-2 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01

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12-2
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
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 12-1
lists the commands used to
configure access lists.
Table 12-1
Access List Configuration Commands
ACL Type
Configuration Commands
Numbered
Standard
access-list
{
1-99
}{
permit
|
deny
}
source-addr
[
source-mask
]
Extended
access-list
{
100-199
}{
permit
|
deny
}
protocol source-addr
[
source-mask
]
destination-addr
[
destination-mask
]
Named
Standard
ip access-list standard
name
followed by
deny
{
source
|
source-wildcard
|
any
}
Extended
ip access-list extended
name
followed by
{permit
|
deny}
protocol
{
source-addr
[
source-mask
] |
any
}{
destination-addr
[
destination-mask
] |
any
}