IP Mobile - same router

[les.flack]

Hi, I have a client with an office LAN based on 6500 acess with collasped distribution/core on two 6500/sup720's. He has a requirement for maintaining the same IP for a laptop when it moves from the IT support LAN to user LAns.

IP mobile sems to fit the bill BUT - can I configure both a home agent and a foreign agent on the same Router?

For a small number of mobile IP's are there any concerns for configuring the foreign agent on production user LAN's?

rgds

[Georg Pauwen]

Hello Les,

not sure about the mobile and foreign agent configured on the same router, but instead of mobile IP, you could try Local Area Mobility (LAM), which is not very scalable, but might suffice in your case, since you only have a small number of IP's.

You configure LAM on the interface where the hosts are connecting to, e.g.:

interface FastEthernet0/0

ip mobile arp access-group 1

!

access-list 1 permit 192.168.1.1

The IP address in the access list would be the one of your roaming user. LAM listens for ARP requests received on that interface that are from hosts which do not belong to the IP subnet of that interface, and then installs the host's IP address in the routing table as a mobile host route.

If you run a routing protocol, don't forget to redistribute the mobile routes with the command 'redistribute mobile'...

HTH,

GP