ZyXEL ZyWALL ATP700 User Guide - Page 449
Additional Topics for IKE SA, Negotiation Mode, VPN, NAT, and NAT Traversal
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Chapter 19 IPSec VPN Table 171 VPN Example: Mismatching ID Type and Content ZYXEL DEVICE REMOTE IPSEC ROUTER Local ID type: E-mail Local ID type: IP Local ID content: [email protected] Local ID content: 1.1.1.2 Peer ID type: IP Peer ID type: E-mail Peer ID content: 1.1.1.20 Peer ID content: [email protected] It is also possible to configure the Zyxel Device to ignore the identity of the remote IPSec router. In this case, you usually set the peer ID type to Any. This is less secure, so you should only use this if your Zyxel Device provides another way to check the identity of the remote IPSec router (for example, extended authentication) or if you are troubleshooting a VPN tunnel. Additional Topics for IKE SA This section provides more information about IKE SA. Negotiation Mode There are two negotiation modes--main mode and aggressive mode. Main mode provides better security, while aggressive mode is faster. Main mode takes six steps to establish an IKE SA. Steps 1 - 2: The Zyxel Device sends its proposals to the remote IPSec router. The remote IPSec router selects an acceptable proposal and sends it back to the Zyxel Device. Steps 3 - 4: The Zyxel Device and the remote IPSec router exchange pre-shared keys for authentication and participate in a Diffie-Hellman key exchange, based on the accepted DH key group, to establish a shared secret. Steps 5 - 6: Finally, the Zyxel Device and the remote IPSec router generate an encryption key (from the shared secret), encrypt their identities, and exchange their encrypted identity information for authentication. In contrast, aggressive mode only takes three steps to establish an IKE SA. Aggressive mode does not provide as much security because the identity of the Zyxel Device and the identity of the remote IPSec router are not encrypted. It is usually used in remote-access situations, where the address of the initiator is not known by the responder and both parties want to use pre-shared keys for authentication. For example, the remote IPSec router may be a telecommuter who does not have a static IP address. VPN, NAT, and NAT Traversal In the following example, there is another router (A) between router X and router Y. ZyWALL ATP Series User's Guide 449
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