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ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual
B-10 Network Planning for Dual WAN Ports (UTM25 Only)
v1.0, September 2009
For a single WAN gateway configuration, use a FQDN when the IP address is dynamic and either
an FQDN or the IP address itself when the IP address is fixed. The situation is different in dual-
WAN port gateway configurations.
• Dual WAN Ports in Auto-Rollover Mode. A dual-WAN port auto-rollover gateway
configuration is different from a single-WAN port gateway configuration when you specify the
IP address of the VPN tunnel endpoint. Only one WAN port is active at a time and when it
rolls over, the IP address of the active WAN port always changes. Therefore, the use of an
FQDN is always required, even when the IP address of each WAN port is fixed.
• Dual WAN Ports in Load Balancing Mode. A dual-WAN port load balancing gateway
configuration is the same as a single-WAN port configuration when you specify the IP address
of the VPN tunnel endpoint. Each IP address is either fixed or dynamic based on the ISP: you
must use FQDNs when the IP address is dynamic and FQDNs are optional when the IP
address is static.
Note: When the UTM’s WAN port rolls over, the VPN tunnel collapses and must be
re-established using the new WAN IP address. However, you can configure
automatic IPsec VPN rollover to ensure that an IPsec VPN tunnel is re-
established.
Figure B-7
Figure B-8