i am not sure if you can assign a specific user a specific IP using the Pix as you can on the Concentrator, but you could create 2 groups (one for PPTP and one for L2TP/IPSec) and have the groups reference 2 different local address pools. at least that have differentiate them and have separate addresses
ip local-pool L2TP-USERS 10.1.5.10-10.1.5.20
ip local-pool PPTP-USERS 10.1.5.21-10.1.5.30
vpdn group L2TP-VPN client configuration address local L2TP-USERS
vpdn group L2TP-VPN client accept dialin l2tp
vpdn group PPTP-VPN client configuration address local PPTP-USERS
vpdn group PPTP-VPN client accept dialin pptp
unless a user from the L2TP group has the initiative to configure a PPTP connection on their own, you should not have a problem.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...