Caimore CM520-6X Series User Manual page 33

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 Phase 1:
 Work Mode:
Main
Aggressive
 Perfect Forward Secrecy(PFS): Accurate forwarding and encrypt. Prevent single key
leakage which affects whole communication system.
 Debug: Turn on debugging information.
 Enable NAT Traversal: If this router is not connecting Internet directly but another
router, please check it.
 Authentication:
Pre-shared Key
Certificates
 Cipher: DES, 3DES, AES, AES128.
 Hash: SHA1, MD5.
 DH Group: Group1, Group2, Group5, Group14, Group15, Group16, Group17 and
Group18.
 SA Lifetime: Phase negotiation time.
 Key: When "Authentication" is "Pre-shared Key", it's the shared key.
 Password: When "Authentication" is "Certificates", it's the password of certificate.
 Phase 2: Phase 2 is protected by phase 1 SA, any message that is not protected by phase
1 will be rejected.
 DH Group: Group1, Group2, Group5, Group14, Group15, Group16, Group17 and
Group18.
 Cipher: DES, 3DES, AES, AES128.
 Hash: SHA1, MD5.
 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.
4.3.2.2 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.
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