Quick Reference Guide

ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336G Reference Manual
Network Planning for Dual WAN Ports B-9
v1.0, January 2010
Virtual Private Networks (VPNs)
When implementing virtual private network (VPN) tunnels, a mechanism must be used for
determining the IP addresses of the tunnel end points. The addressing of the VPN firewall’s dual
WAN port depends on the configuration being implemented:
For the single gateway WAN port case, the mechanism is to use a fully-qualified domain name
(FQDN) when the IP address is dynamic and to use either an FQDN or the IP address itself when
the IP address is fixed. The situation is different when dual gateway WAN ports are used in a
rollover-based system.
Figure B-6
Table B-2. IP addressing requirements for VPNs in dual WAN port systems
Configuration and WAN IP address
Single WAN Port
(reference case)
Dual WAN Port Cases
Rollover
a
a. All tunnels must be re-established after a rollover using the new WAN IP address.
Load Balancing
VPN Road Warrior
(client-to-gateway)
Fixed Allowed
(FQDN optional)
FQDN required Allowed
(FQDN optional)
Dynamic FQDN required FQDN required FQDN required
VPN Gateway-to-Gateway Fixed Allowed
(FQDN optional)
FQDN required Allowed
(FQDN optional)
Dynamic FQDN required FQDN required FQDN required
VPN Telecommuter
(client-to-gateway through
a NAT router)
Fixed Allowed
(FQDN optional)
FQDN required Allowed
(FQDN optional)
Dynamic FQDN required FQDN required FQDN required