802.1x maschine auth with SSL?

Heya, i'm a bit stuck. My xp box should auth with ssl cert - works ok so far. But how to assign vlan? When doing this with user, i put my user + pass into users file - works. But for ssl cert? I want my xp box authentificated by ssl cert and after that, my user should logon to "his" vlan. So that i have a "protected" vlan for "my" boxes (to avoid giving access to my auth server to foreign notebooks) and after that, if someone of my users log in, he will be transfered to his vlan... hope you understand... Thanksalot!