I am configuring an ISA Server in an IPSEC gateway to gateway VPN and I need to use tunnel mode (not L2TP). The ISA VPN wizard only has an option of choosing the following protocols: L2TP over IPSEC use PPTP Use L2TP ove IPSEC if avail. if not use PPTP. Now I am no expert as you have probably figured out, but which protocol would I choose to use "tunnel mode" or am I way off base with this... Any advice would be appreciated.