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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 41 Configuring AAA Rules for Network Access
Configuring Authorization for Network Access
ip:inacl#2=permit udp 10.1.0.0 255.0.0.0 10.0.0.0 255.0.0.0
ip:inacl#100=deny udp any any
ip:inacl#3=permit icmp 10.1.0.0 255.0.0.0 10.0.0.0 255.0.0.0
For information about making unique per user the access lists that are sent in the cisco-av-pair attribute,
see the documentation for your RADIUS server.
On the ASA, the downloaded access list name has the following format:
AAA-user-username
The username argument is the name of the user that is being authenticated.
The downloaded access list on the ASA consists of the following lines. Notice the order based on the
numbers identified on the RADIUS server.
access-list AAA-user-bcham34-79AD4A08 permit tcp 10.1.0.0 255.0.0.0 10.0.0.0 255.0.0.0
access-list AAA-user-bcham34-79AD4A08 permit udp 10.1.0.0 255.0.0.0 10.0.0.0 255.0.0.0
access-list AAA-user-bcham34-79AD4A08 permit icmp 10.1.0.0 255.0.0.0 10.0.0.0 255.0.0.0
access-list AAA-user-bcham34-79AD4A08 deny tcp any any
access-list AAA-user-bcham34-79AD4A08 deny udp any any
Downloaded access lists have two spaces between the word “access-list” and the name. These spaces
serve to differentiate a downloaded access list from a local access list. In this example, “79AD4A08” is
a hash value generated by the ASA to help determine when access list definitions have changed on the
RADIUS server.
Converting Wildcard Netmask Expressions in Downloadable Access Lists
If a RADIUS server provides downloadable access lists to Cisco VPN 3000 series concentrators as well
as to the ASA, you may need the ASA to convert wildcard netmask expressions to standard netmask
expressions. This is because Cisco VPN 3000 series concentrators support wildcard netmask
expressions, but the ASA only supports standard netmask expressions. Configuring the ASA to convert
wildcard netmask expressions helps minimize the effects of these differences on how you configure
downloadable access lists on your RADIUS servers. Translation of wildcard netmask expressions means
that downloadable access lists written for Cisco VPN 3000 series concentrators can be used by the ASA
without altering the configuration of the downloadable access lists on the RADIUS server.
You configure access list netmask conversion on a per-server basis when you add a server to a server
group in the Configuration > Device Management > Users/AAA > AAA Server Groups > AAA Server
Groups area. For more information, see the “Configuring AAA Server Groups” section on page 38-11.
Configuring a RADIUS Server to Download Per-User Access Control List Names
To download a name for an access list that you already created on the ASA from the RADIUS server
when a user authenticates, configure the IETF RADIUS filter-id attribute (attribute number 11) as
follows:
filter-id=acl_name
Note In Cisco Secure ACS, the values for filter-id attributes are specified in boxes in the HTML interface,
omitting filter-id= and entering only acl_name.
For information about making the filter-id attribute value unique per user, see the documentation for your
RADIUS server.
To create an access list on the ASA, see Chapter 21, “Using the ACL Manager.”