ZyXEL NBG-460N User Guide - Page 191
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Chapter 15 IPSec VPN Table 65 Security > VPN > General > Rule Setup: IKE (Basic) (continued) LABEL DESCRIPTION NAT Traversal Select this check box to enable NAT traversal. NAT traversal allows you to set up a VPN connection when there are NAT routers between the two IPSec routers. Note: The remote IPSec router must also have NAT traversal enabled. IPSec Keying Mode DNS Server (for IPSec VPN) You can use NAT traversal with ESP protocol using Transport or Tunnel mode, but not with AH protocol nor with manual key management. In order for an IPSec router behind a NAT router to receive an initiating IPSec packet, set the NAT router to forward UDP ports 500 and 4500 to the IPSec router behind the NAT router. Select IKE or Manual from the drop-down list box. IKE provides more protection so it is generally recommended. Manual is a useful option for troubleshooting if you have problems using IKE key management. If there is a private DNS server that services the VPN, type its IP address here. The NBG-460N assigns this additional DNS server to the NBG-460N's DHCP clients that have IP addresses in this IPSec rule's range of local addresses. Local Policy A DNS server allows clients on the VPN to find other computers and servers on the VPN by their (private) domain names. Local IP addresses must be static and correspond to the remote IPSec router's configured remote IP addresses. Local Address Two active SAs can have the same configured local or remote IP address, but not both. You can configure multiple SAs between the same local and remote IP addresses, as long as only one is active at any time. For a single IP address, enter a (static) IP address on the LAN behind your NBG-460N. For a specific range of IP addresses, enter the beginning (static) IP address, in a range of computers on your LAN behind your NBG-460N. Local Address End /Mask To specify IP addresses on a network by their subnet mask, enter a (static) IP address on the LAN behind your NBG-460N. When the local IP address is a single address, type it a second time here. When the local IP address is a range, enter the end (static) IP address, in a range of computers on the LAN behind your NBG-460N. Remote Policy When the local IP address is a subnet address, enter a subnet mask on the LAN behind your NBG-460N. Remote IP addresses must be static and correspond to the remote IPSec router's configured local IP addresses. Two active SAs cannot have the local and remote IP address(es) both the same. Two active SAs can have the same local or remote IP address, but not both. You can configure multiple SAs between the same local and remote IP addresses, as long as only one is active at any time. NBG-460N User's Guide 191