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ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual
Network Planning for Dual WAN Ports (UTM25 Only) B-17
v1.0, September 2009
VPN Telecommuter: Dual Gateway WAN Ports for Improved Reliability
In a dual-WAN port auto-rollover gateway configuration, the remote PC client initiates the VPN
tunnel with the active gateway WAN port (port WAN1 in Figure B-18) because the IP address of
the remote NAT router is not known in advance. The gateway WAN port must act as the responder.
The IP addresses of the gateway WAN ports can be either fixed or dynamic, but you must always
use a FQDN because the active WAN port could be either WAN1 or WAN2 (that is, the IP address
of the active WAN port is not known in advance).
After a rollover of the WAN port has occurred, the previously inactive gateway WAN port
becomes the active port (port WAN2 in Figure B-19) and the remote PC must re-establish the VPN
tunnel. The gateway WAN port must act as the responder.
Figure B-18
Figure B-19