Netgear UTM25-100NAS User Manual

7-1

This chapter describes how to use the IP security (IPsec) virtual private networking (VPN) features 
of the UTM to provide secure, encrypted communications between your local network and a 
remote network or computer. This chapter contains the following sections:

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On the UTM25 only, if both of the WAN ports are configured, you can enable either auto-rollover 
mode for increased system reliability or load balancing mode for optimum bandwidth efficiency. 
Your WAN mode selection impacts how the VPN features must be configured.

The use of fully qualified domain names (FQDNs) in VPN policies is mandatory when the WAN 
ports function in auto-rollover mode or load balancing mode, and is also required for VPN tunnel 
failover. When the WAN ports function in load balancing mode, you cannot configure VPN tunnel 
failover. A FQDN is optional when the WAN ports function in load balancing mode if the IP 
addresses are static but mandatory if the WAN IP addresses are dynamic.

 for more information about the IP addressing 

requirements for VPNs in the dual WAN modes. For information about how to select and 
configure a dynamic DNS service for resolving FQDNs, see 

. For information about WAN mode configuration, see