NETGEAR UTM25EW-100NAS, UTM25-100NAS, UTM10EW-100NAS manual Figure B-2

ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual

These various types of traffic and auto-rollover or load balancing all interact to make the planning process more challenging:

•Inbound Traffic. Unrequested incoming traffic can be directed to a PC on your LAN rather than being discarded. The mechanism for making the IP address public depends on whether the dual WAN ports are configured for auto-rollover or load balancing.

•Virtual Private Networks. A virtual private network (VPN) tunnel provides a secure communication channel between either two gateway VPN firewalls or between a remote PC client and gateway VPN firewall. As a result, the IP address of at least one of the tunnel endpoints must be known in advance in order for the other tunnel end point to establish (or re- establish) the VPN tunnel.

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.

•Dual WAN Ports in Auto-Rollover Mode. Rollover for an UTM with dual WAN ports is different from a single-WAN port gateway configuration when you specify the IP address. 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 a fully qualified domain name (FQDN) is always required, even when the IP address of each WAN port is fixed.

Figure B-2

Features such as multiple exposed hosts are not supported in auto-rollover mode because the IP addresses of each WAN port must be in the identical range of fixed addresses.

B-6 Network Planning for Dual WAN Ports (UTM25 Only)

v1.0, September 2009