mobile ip configuration

Hi all, I am configuring mobile ip on cisco 7200 series router. The mobile hosts are connected to the home - agent using a virtual network. so , after typing config terminal in enable mode , i gave the following commands :

router#ip mobile home-agent address 173.8.12.5 router#ip mobile virtual-network 173.0.0.0 255.0.0.0

But , after the second command ,its displaying : %Insert virtual network 173.0.0.0 mask 255.0.0.0 failed

Can anyone please help me out. I am a newbie in this field.

Thanks in advance.

Regards vamsi.

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vamsi.komati
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