Authentication of users from the remote end of the site-to-site VPN tunnel created between PIX's

[admin_2]

We have a site-to-site VPN tunnel created between two sites using two PIX's running version 6.1(1) software.

We want to authenticate the users to be authenticated using RADIUS / TACACS+ server before they can access the network.Is it possible to do that? If Yes, how?

[#2]

Yes, virtual telnet command

more info avail. at http://www.cisco.com/warp/public/110/atp52.html