Thursday, March 21, 2013

L2TP with MPPE

For my understanding L2TP usually use IPsec for security, but today I tested a cpe router which has a L2TP client which use MPPE. I was puzzled but then I figured out that CISCO ios support L2TP with MPPE. You just need to add the line "ppp encrypt mppe auto" to the virtual template,

vpdn-group L2TP-pure
  protocol l2tp
  virtual-template 52

interface Virtual-Template52
 ip unnumbered Loopback1
 ip nat inside
 ip virtual-reassembly
 peer default ip address pool L2TP-POOL
ppp encrypt mppe auto

ip local pool L2TP-POOL

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