l2tp

from The Free On-line Dictionary of Computing (8 July 2008)

Layer Two Tunneling Protocol
L2TP

   <protocol> (L2TP) An {IETF} standard {protocol} for creating
   {Virtual Private Networks}.  L2TP is an {open standard} with
   mutlivendor {interoperability} and acceptance.

   Compare: {PPTP}.

   [Sponsored by {Cisco Systems, Inc.}?]

   (1998-09-24)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

L2TP
       Layer 2 Tunneling Protocol (PPP, VPN, IP, RFC 2661)