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User Authentication for home-office scenario



My question (below) relates to an IPSEC implementation of
a VPN between a mobile/home user's PC and a corporate VPN 
gateway/firewall protecting a secured network.

Is there a standard for authenticating the user with the
VPN server? The idea is that once the mobile user
authenticates with the authentication service at the
VPN server, he can be allowed into the secured network. 

I am more interested in a standard protocol/message exchange
sequence (based on some standard) as opposed to different
schemes such as user/password, one-time-passwords, token cards
etc.

What do most commercial remote-user/corporate-VPN-server 
implementations do for user authentication? Do they use
proprietary protocols?

Any help would be greatly appreciated. (Please reply
directly to me)



Sanjay Sawhney

(sanjay@ukiahsoft.com)




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