Firewall doesn't mach on user name ?

Firewall doesn't mach on user name, Firewall macht only on IP adress.
I made 2 users on Asraro, and 3 rules
1. user_1 allow to 192.168.2.1
2. user_1 deny to any
3. user_2 allow to any

I try connect per VPN SSL with user_1, I recieve IP from IP-pool 172.1.6.6
and I can rich only 192.168.2.1,..
then... I log off
and try to connect with user_2, I recieve the same IP from IP-pool 172.1.6.6
and cannot reach any... I can reach only 192.168.2.1

why Astaro doesn't mach on user?

Thanks!