HKLM\SYSTEM\CurrentControlSet\Services\
The Rasl2tp subkey stores configuration data for the Layer 2 Tunneling Protocol (L2TP) support in Routing and Remote Access.
L2TP is an industry standard tunneling protocol. Unlike Point-to-point tunneling protocol (PPTP), which is based on TCP, L2TP is based on UDP.
Related Entries
WAN Miniport (L2TP) <Device-number (000n)> subkey