Mobile IP Technology and Applications

140 Chapter 6: Metro Mobility: Client-Based Mobile IP

Evaluating the Metro Mobility Example

A Mobile Nodes operating in the environment shown in Example 6-1 can have many different

states than those seen in Chapter 4, “IOS Mobile IP in the Lab.” Cisco IOS show commands

can determine the states for the feature presented in the chapter.

To determine whether a Mobile Nodes is using reverse tunneling, look under the routing options

section of the show ip mobile binding command, as follows. If “(T)Reverse-tunnel” is listed,

the Mobile Nodes is using reverse tunneling.

HA#show ip mobile binding

Mobility Binding List:

Total 1

192.168.100.10:

Care-of Addr 192.168.5.1, Src Addr 192.168.5.1

Lifetime granted 10:00:00 (36000), remaining 09:40:54

Flags sbdmg-T-, Identification C5C75C51.A5787D48

Tunnel1 src 192.168.1.2 dest 192.168.5.1 reverse-allowed

Routing Options - (T)Reverse-tunnel

The path MTU supported by a tunnel is listed in the output of the show ip mobile tunnel command,

as follows. The configured MTU of the tunnel is listed as “IP MTU.” The discovered MTU is listed

under “Path MTU Discovery”; if this value is 0, the configured value can transit the path.

HA#show ip mobile tunnel

Mobile Tunnels:

Foreign Agent Configuration with UDP Tunneling

hostname FA2

!

!

interface Ethernet0/0

ip address 192.168.4.2 255.255.255.0

ip mobile foreign-service

!

interface Ethernet1/0

ip address 192.168.6.1 255.255.255.0

ip irdp

ip irdp maxadvertinterval 4

ip irdp minadvertinterval 3

ip irdp holdtime 9

ip mobile foreign-service reverse-tunnel

!

router mobile

!

router ospf 1

network 192.168.0.0 0.0.255.255 area 1

!

ip mobile foreign-agent care-of Ethernet1/0

ip mobile foreign-agent nat traversal keepalive 20

!

end

Example 6-1 Configurations for a Metro Mobility Solution (Continued)