Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol that extends Point-to-Point Protocol (PPP) to support a link layer tunnel between a requesting L2TP client (L2TP Access Concentrator or LAC) and a target L2TP server endpoint (L2TP Network Server or LNS).
http://publib.boulder.ibm.com/infocenter/iseries/v6r1m0/index.jsp?topic=/rzaiy/rzaiyl2tpsupport.htm
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