NETGEAR UTM25-100NAS, UTM10EW-100NAS manual Inbound Traffic to a Single WAN Port System

ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual

•Dual WAN Ports in Load Balancing Mode. Load balancing for an UTM with dual WAN ports is similar to a single WAN gateway configuration when you specify the IP address. Each IP address is either fixed or dynamic based on the ISP: You must use FQDNs when the IP address is dynamic but FQDNs are optional when the IP address is static.

Figure B-3

Inbound Traffic

Incoming traffic from the Internet is normally discarded by the UTM unless the traffic is a response to one of your local computers or a service for which you have configured an inbound rule. Instead of discarding this traffic, you can configure the UTM to forward it to one or more LAN hosts on your network.

The addressing of the UTM’s dual WAN port depends on the configuration being implemented:

Table B-1. IP Addressing Requirements for Exposed Hosts in Dual WAN Port Systems

Configuration and		Single WAN Port	Dual WAN Port Cases
WAN IP address		(reference case)	Rollover	Load Balancing
Inbound traffic	Fixed	Allowed	FQDN required	Allowed
• Port forwarding		(FQDN optional)		(FQDN optional)
• Port triggering
	Dynamic	FQDN required	FQDN required	FQDN required

Inbound Traffic to a Single WAN Port System

The Internet IP address of the UTM’s WAN port must be known to the public so that the public can send incoming traffic to the exposed host when this feature is supported and enabled.

Network Planning for Dual WAN Ports (UTM25 Only) B-7

v1.0, September 2009