Authenticated routing?

Hi, I am looking for a solution to authenticate routing. IPSEC CLient (Mostly WinXX boxes) connects to firewall. Firewall untunnels packets (FreeS/WAN) Firewall authenticates user ???????? Successful authentication enables routing of the clients Packets into the internal net. Commercial FWs like FW1 have that feature, but I'd rather run it on Linux. Thanks for any pointers afx -- atsec information security GmbH Phone: +49-89-44249830 Steinstrasse 68 Fax: +49-89-44249831 D-81667 Muenchen, Germany WWW: www.atsec.com May the Source be with you!