Cisco ASA 5500 Series Configuration Guide using the CLI, 8.4 and 8.6

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Updated:
November 14, 2018

Chapter: Adding a Standard Access List

Adding a Standard Access List

This chapter describes how to configure a standard access list and includes the following sections:

Information About Standard Access Lists

Standard access lists identify the destination IP addresses of OSPF routes and can be used in a route map for OSPF redistribution. Standard access lists cannot be applied to interfaces to control traffic.

Licensing Requirements for Standard Access Lists

The following table shows the licensing requirements for this feature:

 

Model
License Requirement

All models

Base License.

Guidelines and Limitations

This section includes the guidelines and limitations for this feature:

Context Mode Guidelines

Supported in single context mode only.

Firewall Mode Guidelines

Supported in routed and transparent firewall modes.

IPv6 Guidelines

Supports IPv6.

Additional Guidelines and Limitations

The following guidelines and limitations apply for standard Access Lists:

  • Standard ACLs identify the destination IP addresses (not source addresses) of OSPF routes and can be used in a route map for OSPF redistribution. Standard ACLs cannot be applied to interfaces to control traffic.
  • To add additional ACEs at the end of the access list, enter another access-list command, specifying the same access list name.
  • When used with the access-group command, the deny keyword does not allow a packet to traverse the ASA. By default, the ASA denies all packets on the originating interface unless you specifically permit access.
  • When specifying a source, local, or destination address, use the following guidelines:

–blank.gif Use a 32-bit quantity in four-part, dotted-decimal format.

–blank.gif Use the keyword any as an abbreviation for an address and mask of 0.0.0.0.0.0.0.0.

–blank.gif Use the host ip_address option as an abbreviation for a mask of 255.255.255.255.

  • You can disable an ACE by specifying the keyword inactive in the access-list command.

Default Settings

Table 17-1 lists the default settings for standard Access List parameters.

 

Table 17-1 Default Standard Access List Parameters

Parameters
Default

deny

The ASA denies all packets on the originating interface unless you specifically permit access.

Access list logging generates system log message 106023 for denied packets. Deny packets must be present to log denied packets.

Adding Standard Access Lists

This section includes the following topics:

Task Flow for Configuring Extended Access Lists

Use the following guidelines to create and implement an access list:

Adding a Standard Access List

To add an access list to identify the destination IP addresses of OSPF routes, which can be used in a route map for OSPF redistribution, enter the following command:

 

Command
Purpose
hostname(config)# access-list access_list_name standard { deny | permit } { any | ip_address mask }
 

hostname(config)# access-list OSPF standard permit 192.168.1.0 255.255.255.0

 

Adds a standard access list entry. To add another ACE to the end of the access list, enter another access-list command, specifying the same access list name.

The access_list_name argument specifies the name of number of an access list.

The any keyword specifies access to anyone.

The deny keyword denies access if the conditions are matched.

The host ip_address syntax specifies access to a host IP address.

The ip_address ip_mask argument specifies access to a specific IP address and subnet mask.

The line line-num option specifies the line number at which to insert an ACE.

The permit keyword permits access if the conditions are matched.

To remove an ACE, enter the no access-list command with the entire command syntax string as it appears in the configuration.

Adding Remarks to Access Lists

You can include remarks about entries in any access list, including extended, EtherType, IPv6, standard, and Webtype access lists. The remarks make the access list easier to understand.

To add a remark after the last access-list command you entered, enter the following command:

 

Command
Purpose
access-list access_list_name remark text
 
hostname(config)# access-list OUT remark - this is the inside admin address
 

 

Adds a remark after the last access-list command you entered.

The text can be up to 100 characters in length. You can enter leading spaces at the beginning of the text. Trailing spaces are ignored.

If you enter the remark before any access-list command, then the remark is the first line in the access list.

If you delete an access list using the no access-list access_list_name command, then all the remarks are also removed.

Example

You can add a remark before each ACE, and the remarks appear in the access lists in these location. Entering a dash (-) at the beginning of a remark helps to set it apart from an ACE.

hostname(config)# access-list OUT remark - this is the inside admin address
hostname(config)# access-list OUT extended permit ip host 209.168.200.3 any
hostname(config)# access-list OUT remark - this is the hr admin address
hostname(config)# access-list OUT extended permit ip host 209.168.200.4 any
 

What to Do Next

Apply the access list to an interface. See the “Configuring Access Rules” section for more information.

Monitoring Access Lists

To monitor access lists, perform one of the following tasks:

 

Command
Purpose
show access-list

Displays the access list entries by number.
show running-config access-list

Displays the current running access-list configuration.

Configuration Examples for Standard Access Lists

The following example shows how to deny IP traffic through the ASA:

hostname(config)# access-list 77 standard deny

 

The following example shows how to permit IP traffic through the ASA if conditions are matched:

hostname(config)# access-list 77 standard permit

 

The following example shows how to specify a destination address:

hostname(config)# access-list 77 standard permit host 10.1.10.123

 

Feature History for Standard Access Lists

Table 17-2 lists each feature change and the platform release in which it was implemented.

 

Table 17-2 Feature History for Standard Access Lists
Feature Name
Releases
Feature Information

Standard access lists

7.0(1)

Standard access listsidentify the destination IP addresses of OSPF routes, which can be used in a route map for OSPF redistribution.

We introduced the feature and the following command: access-list standard.

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