ZyXEL Communications P-334W - Manual (Page 222)

Prestige 334W User’s Guide
16-12 VPN Screens
Table 16-7 VPN: Rule Setup (Basic)
LABEL DESCRIPTION
Active Select this check box to activate this VPN tunnel. This option determines whether a
VPN rule is applied before a packet leaves the firewall.
Keep Alive Select this check box to have the Prestige automatically re-initiate the SA after the
SA lifetime times out, even if there is no traffic. The remote IPSec router must also
have keep alive enabled in order for this feature to work.
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.
The remote IPSec router must also have NAT traversal enabled.
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 port 500 to the IPSec router behind the NAT router.
IPSec Keying
Mode 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.
Local Address The local IP address must be static and correspond to the remote IPSec router's
configured remote IP addresses.
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.
Remote Address
Start Remote IP addresses must be static and correspond to the remote IPSec router's
configured local IP addresses. The remote address fields do not apply when the
Secure Gateway Address field is configured to 0.0.0.0. In this case only the
remote IPSec router can initiate the VPN.
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.
Enter a (static) IP address on the network behind the remote IPSec router.
Remote Address
End/Mask When the remote IP address is a single address, type it a second time here.
When the remote IP address is a range, enter the end (static) IP address, in a range
of computers on the network behind the remote IPSec router.
When the remote IP address is a subnet address, enter a subnet mask on the
network behind the remote IPSec router.