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:
Router(config)# interface tunnel 10
ip access-group 150 in -------> apply access-list 150
access-list 150 deny any 10.10.0.0 0.255.255.255
access-list permit any any
------> permit all but traffic to 10.10.0.0 network
ip mobile home-agent template tunnel 10 address 10.0.0.1
Configures a tunnel template.
Configures the ACL.
Configures a Home Agent to use the template tunnel.
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 22.214.171.124
Care-of Addr 126.96.36.199, Src Addr 188.8.131.52
Lifetime granted 00:01:30 (90), remaining 00:00:51
Flags sbDmg-T-, Identification C661D5A0.4188908
Tunnel1 src 184.108.40.206 dest 220.127.116.11 reverse-allowed
Tunnel1 Input ACL: inaclname
Tunnel1 Output ACL: outaclname - Empty list or not configured.
MR Tunnel1 src 18.104.22.168 dest 22.214.171.124 reverse-allowed
Routing Options - (D)Direct-to-MN (T)Reverse-tunnel
Mobile Networks: 126.96.36.199/255.0.0.0 (S)
Sent on tunnel to MN: 0 packets, 0 bytes
Received on reverse tunnel from MN: 0 packets, 0 bytes
router# show ip mobile tunnel
Total mobile ip tunnels 1
src 188.8.131.52, dest 184.108.40.206
encap IP/IP, mode reverse-allowed, tunnel-users 1
Input ACL users 1, Output ACL users 1
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