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Cisco IOS Cookbook, 2nd Edition by Ian Brown, Kevin Dooley

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Local Area Mobility

Problem

You want to set up Local Area Mobility to allow devices to roam throughout your network.

Solution

In this example, the roaming device will have a statically configured address in the 192.168.10.0/24 range. We have to configure the home router to use Proxy ARP for mobile nodes, allowing other locally connected devices in the same range to communicate transparently with the roaming device:

RouterHome#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
RouterHome(config)#interface FastEthernet0/0
RouterHome(config-if)#ip address 192.168.10.1 255.255.255.0
RouterHome(config-if)#ip proxy-arp
RouterHome(config-if)#ip mobile arp
RouterHome(config-if)#exit
RouterHome(config)#router eigrp 99
RouterHome(config-router)#network 192.168.10.0
RouterHome(config-router)#default-metric 10000 10 255 1 1500
RouterHome(config-router)#redistribute mobile
RouterHome(config-router)#no auto-summary
RouterHome(config-router)#exit
RouterHome(config)#end
RouterHome#

Then we have to configure the foreign router, which supports the network segment where our roaming node temporarily finds itself:

RouterForeign#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
RouterForeign(config)#interface FastEthernet0/0
RouterForeign(config-if)#ip address 192.168.110.1 255.255.255.0
RouterForeign(config-if)#ip proxy-arp
RouterForeign(config-if)#ip mobile arp
RouterForeign(config-if)#exit
RouterForeign(config)#router eigrp 99 RouterForeign(config-router)# ...

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