6. L2TP security
Security in L2TP consists essentially of authentication mechanisms. Transporting PPP frames, authentication at this level already provides a minimum of security, usually accompanied by authentication of the tunnel (i.e. the communicating endpoints, the LAC and the LNS). In addition, the definition of certain AVPs has reinforced this security. Finally, combinations of L2TP with well-known security mechanisms have been defined; for example, the use of L2TP with IPsec is recommended by the IETF, and the joint use of L2TP and RADIUS further enhances exchange security.
6.1 AVPs
There are two AVPs that can play a role in security for L2TP:
The first is the AVP Random Vector (Attribute Type 36) used in conjunction with...
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L2TP security
L2TP applications on Layer 2 protocols
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