Configuring RADIUS Server Support for Switch Services
Configuring and Using RADIUS-Assigned Access Control Lists
< ipv4-addr >: Specifies a single destination IPv4 address.
< ipv4-addr /< mask >: Specifies a series of contiguous destination addresses or all
destination addresses in a subnet. The < mask > is CIDR notation for the number of
leftmost bits in a packet’s destination IPv4 address that must match the corre-
sponding bits in the destination IPv4 address listed in the ACE. For example, a
destination of 10.100.17.1/24 in the ACE means that a match occurs when an
inbound packet (of the designated IPv4 type) from the authenticated client has a
destination IPv4 address where the first three octets are 10.100.17. (The fourth octet
is a wildcard, and can be any value up to 255.)
[ tcp/udp-port | tcp/udp-port-range]: Optional TCP or UDP port specifier. Used when the ACE
is intended to filter client TCP or UDP traffic with one or more specific TCP or UDP
destination port numbers. You can specify port numbers as individual values and/or
ranges. For example, the following ACE shows two ways to deny any UDP traffic from an
authenticated client that has a DA of any address and a UDP destination port of 135, 137-
139, or 445:
deny in udp from any to any 135, 137-139, 445
deny in 17 from any to any 135, 137-139, 445
[ icmp-type ]
: Optional ICMP type specifier. This can be either a keyword or an ICMP type
number. For a listing of numbers and types, refer to table 6-5, “ICMP Type Numbers and
Keywords” on page 6-28.
[ cnt ]: Optional counter specifier for a RADIUS-assigned ACE. When used, the counter
increments each time there is a “match” with the ACE. This option does not require that
you configure the switch for RADIUS accounting.
Example Using the Standard Attribute (92) In an IPv4 ACL
The Standard attribute (92) filters IPv4 traffic inbound from the authenticated
client. (Any IPv6 traffic inbound from the client is dropped.) This example
illustrates configuring RADIUS-assigned IPv4 ACL support on FreeRADIUS
using the standard attribute for two different client identification methods
(username/password and MAC address).
1. Enter the ACL standard attribute in the FreeRADIUS dictionary.rfc4849 file.
ATTRIBUTE Nas-FILTER-Rule 92
2. Enter the switch IP address, NAS (Network Attached Server) type, and
the key used in the FreeRADIUS clients.conf file. For example, if the switch
IP address is 10.10.10.125 and the key (“secret”) is “1234”, you would enter
the following in the server’s clients.conf file:
6-20
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