Caimore CM520-86 User Manual page 31

SA Lifetime: Phase negotiation time.
 Other Parameters:
 DPD Delay / DPD timeout: After tunnel is built, in order to check tunnel state, router
will send LCP packet in every tunnel check interval. When the number of
tunnel-checking failures over the value of "DPD timeout", router will initiate to
terminate the connection and send a request to rebuild the tunnel.
 IPcomp: IP payload compression.
4.3.3.2 L2TP
L2TP (Layer 2 Tunneling Protocol) is a kind of VPDN technology, it's specifically used
in transferring data in layer 2 tunnel. Also means it'll encapsulate data units of layer 2(such
as PPP data) within an IP or UDP payload.
 Server: IP address or domain of PPTP server.
 Remote Subnet / Remote Mask: Intranet information on server side.
 User / Password: LAC username and password.
 Protocol: The way of PPTP to perform PPP authentication --
Pap: in this way, username and password are transmitted in clear text, the security
level of it is low.
Chap
MS-Chap
MS-Chap-V2
Any: it will take one of four approaches to verify.
 MPPE: Way to encrypt --
NoMppe: No encryption.
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