Check out the section around page 136. It talks about distributing certificates to QuickVPN users. But road warriors will need a certificate in their quickVPN directory as per the manual and also use login and password.
Regarding using a Linux client, I have no experience and await the community to comment. But since we are Using GPL code on the RVS4000, I would suspect that there are client already that will work with linux PC's. But acocdotal information for another post shows no luck in getting linux client to work;
From what I see, it looks like I should be able to establish IPsec connection (using passphrase approach) from a Linux machine. This would be what the Cisco manual refers to us site to site (tunnel) connection. i.e. not the VPN client account
As for the "VPN client" connection, this is not pure IPsec as it requires some SSL (443) preamble. So I won't be pursuing that route. (no pun intended) It does work though with the QVPN PC software. Bit of a pain to setup as it required SP3 or a patch. (details in the QVPN ZIP). Also, IPSEC service needed to be manually started. (run services.msc)
I have an outside router (DLINK) sitting in front of the Cisco RVS4000 and it is working with IPSec VPN with both the IP Securitas software (Mac OSX leopard) and the Green Bow software for the PC connecting from a remote location. I didn't use Quick VPN as it didn't seem to working properly with the PC here. Using passphrase. Make sure you have UDP port 500 opened as well as protocol 50 (for ESP) to make IPSec work.
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