NETGEAR STM150EW-100NAS, UTM5EW-100NAS manual Overview of the WAN Modes, 611

ProSecure Unified Threat Management (UTM) Appliance

Overview of the WAN Modes

You cannot configure failure detection settings for the USB interface, but you can configure the USB interface to participate in load balancing or function as a rollover interface in case the primary WAN interface goes down.

If you have configured an Ethernet WAN interface or a DSL WAN interface in addition to the USB WAN interface, the UTM9S or UTM25S can be configured on a mutually exclusive basis for either auto-rollover (for increased system reliability) or load balancing (for maximum bandwidth efficiency). If you do not select load balancing, you need to specify one WAN interface (the DSL interface or an Ethernet interface) as the primary interface.

Note: In this section and the following sections of this appendix, the DSL WAN interface is referred to as the DSL interface, the Ethernet WAN interfaces are referred to as the WAN interfaces, and the USB WAN interface is referred to as the USB interface.

•Load balancing mode. The UTM9S or UTM25S distributes the outbound traffic equally among the DSL, USB, and WAN interfaces that are functional. The UTM9S and UTM25S support weighted load balancing and round-robin load balancing (see Configure Load Balancing and Optional Protocol Binding on page 614).

Note: Scenarios could arise when load balancing needs to be bypassed for certain traffic or applications. If certain traffic needs to travel on the DSL interface or a specific WAN interface, configure protocol binding rules for that interface. The rule should match the desired traffic.

•Primary WAN mode. The USB interface, a WAN interface, or the DSL interface) is made the primary interface. The other interfaces are disabled.

•Auto-rollover mode. You cannot configure the USB interface as the primary link in an auto-rollover configuration, but you can configure it as the rollover link. A DSL or WAN interface is defined as the primary link, and another interface needs to be defined as the rollover link. Because there can be four interfaces on the UTM9S and UTM25S (one DSL, one USB, and two WAN interfaces), the remaining interfaces are disabled.

As long as the primary link is up, all traffic is sent over the primary link. When the primary link goes down, the rollover link is brought up to send the traffic. When the primary link comes back up, traffic automatically rolls back to the original primary link.

If you want to use a redundant ISP link for backup purposes, select the DSL or WAN interface that needs to function as the primary link for this mode. Ensure that the backup interface has also been configured and that you configure the WAN failure detection method on the WAN Advanced Options screen to support auto-rollover for the WAN or DSL interface.

3G/4G Dongles for the UTM9S and UTM25S

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