Cisco IOS Mobile Wireless Home Agent Configuration Guide,Cisco IOS Release 15.1M&T

Per User Packet Filtering

This chapter discusses Per-User Packet Filtering and its implementation in Cisco IOS Mobile Wireless Home Agent software.

This chapter includes the following sections:

•Mobile-User ACLs in Packet Filtering

•Configuring ACLs on the Tunnel Interface

•Verifying ACLs are Applied to a Tunnel

Mobile-User ACLs in Packet Filtering

The Home Agent supports per user packet filtering. Packet filtering provides that, for a successfully authenticated registration request, the RADIUS server will return "inACL" and "outACL" attributes in an access response to the HA. "inACL" and "outACL" attributes identify the pre-configured ACLs on the HA that are applied to mobility bindings. An input ACL applies to traffic from the user leaving the tunnel. An output ACL applies to traffic sent to the user using the tunnel. The attributes are synched to the standby HA during normal sync and bulksync operation. Here are some additional conditions associate with this feature:

•The show ip mobile binding command displays ACLs applied to a mobility binding. Only the ACLs downloaded at the time of initial authentication are applied. An ACL downloaded at the time of mobile re-authentication, for lifetime renewal, is not applied.

•The HA will accept one input ACL name and one output ACL name for each user.

•Only named extended access-lists are supported for this feature.

Note Performance is significantly degraded when mobile user ACLs are applied to a large number of mobility bindings.

The Home Agent can filter both egress packets from an external data network and ingress data packets based on the Foreign Agent IP address or the Mobile Node IP address.

Configuring ACLs on the Tunnel Interface

To configure ACLs to block certain traffic using the template tunnel feature, perform the following task:

Verifying ACLs are Applied to a Tunnel

Here is example output of the show ip mobile binding command:

ACLs Applied to a Mobility Binding and Accounting Session ID and Accounting Counters

router# show ip mobile binding 44.0.0.1

Mobility Binding List:

	44.0.0.1: 

	Care-of Addr 55.0.0.11, Src Addr 55.0.0.11

	Lifetime granted 00:01:30 (90), remaining 00:00:51

	Flags sbDmg-T-, Identification C661D5A0.4188908

	Tunnel1 src 46.0.0.3 dest 55.0.0.11 reverse-allowed

	Tunnel1 Input ACL: inaclname 

	Tunnel1 Output ACL: outaclname - Empty list or not configured.

	MR Tunnel1 src 46.0.0.3 dest 55.0.0.11 reverse-allowed

	Routing Options - (D)Direct-to-MN (T)Reverse-tunnel

	Mobile Networks: 111.0.0.0/255.0.0.0 (S)

	Acct-Session-Id: 0

	Sent on tunnel to MN: 0 packets, 0 bytes

	Received on reverse tunnel from MN: 0 packets, 0 bytes

router# show ip mobile tunnel

Mobile Tunnels:

	Total mobile ip tunnels 1

	Tunnel0:

	src 46.0.0.3, dest 55.0.0.11

	encap IP/IP, mode reverse-allowed, tunnel-users 1

	Input ACL users 1, Output ACL users 1 

	IP MTU 1480 bytes

	Path MTU Discovery, mtu: 0, ager: 10 mins, expires: never

	outbound interface Ethernet1/0

	HA created, fast switching enabled, ICMP unreachable enabled

	5 minute input rate 0 bits/sec, 0 packets/sec

	5 minute output rate 0 bits/sec, 0 packets/sec

	0 packets input, 0 bytes, 0 drops

0 packets output, 0 bytes