IPv4 Access Control Lists (ACLs)
Overview
Static Port ACL and Dynamic Port ACL Applications
An IPv4 static port ACL filters any IPv4 traffic inbound on the designated port,
regardless of whether the traffic is switched or routed.
Dynamic (RADIUS-assigned) Port ACL Applications
Dynamic (RADIUS-assigned) port ACLs are configured on RADIUS servers
and, where such servers support configuration for IPv4 traffic filtering, can
be assigned to filter IPv4 traffic inbound from clients authenticated by such
servers. For example, client “A” connects to a given port and is authenticated
by a RADIUS server. Because the server is configured to assign a dynamic ACL
to the port, the IPv4 traffic inbound on the port from client “A” is filtered.
Effect of Dynamic Port ACLs When Multiple Clients Are Using the
Same Port. Some network configurations may allow multiple clients to
authenticate through a single port where a RADIUS server assigns a separate,
dynamic port ACL in response to each client’s authentication on that port. In
such cases, a given client’s inbound traffic will be allowed only if the RADIUS
authentication response for that client includes a dynamic port ACL. For
example, in figure 9-1 (below), clients A through D authenticate through the
same port (B1) on the ProCurve-A switch.
Unmanaged
Switch
RADIUS
Server
Client D
Client C
ProCurve-A
Client A
Client B
10.100.0.0
LAN
Port B1
Figure 9-1. Example of Multiple Clients Authenticating Through a Single Port
In this case, the RADIUS server must be configured to assign a dynamic port
ACL to port B1 each time any of the clients authenticates on the port.
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