Setting Up A Dual-WAN Router with a DSL and Cable Provider

Small Net Builder walks through setting up a Dual-WAN router. Dual-WAN routers allow you to setup your home network with service from two separate service providers (in the example a DSL and cable company):

Failover vs. Load Balancing


Better failure detection methods include pinging your ISP's default gateway, pinging a host on your ISP's network, pinging a host elsewhere on the Internet, resolving and pinging an FQDN (fully qualified domain name) or making a TCP connection to an external server.


With load balancing enabled, it is important to configure your router with the speeds of your Internet connections. Many dual WAN routers' default load balancing algorithm equally distribute traffic over both WAN connections. If your Internet connection speeds are not the same, your router needs to know both connection speeds to distribute the traffic load accordingly...

The two routers Small Net Builder uses in their setup article are the Linksys LRT224 ($175) and the ZyWALL 110 ($369). Neither of these routers have wireless radios so you will need to bridge to a separate device for that.


Bandwidth Management

Let's say I want to ensure my Netflix streaming device has enough bandwidth for smooth playback. Netflix recommends 5 Mbps for HD quality streaming.

I would start by giving my Netflix device a static IP address on my network. On the Linksys LRT224, the default LAN network uses the subnet, and the DHCP range is Thus, I could give my Netflix device a static IP address of

In the Linksys LRT224 rule shown below , I've configured both WAN interfaces to allow all traffic to a minimum of 5 Mbps and a maximum of 6 Mbps. The goal in bandwidth management is to give the traffic-sensitive device(s) enough bandwidth, without limiting bandwidth for other devices and users too much. If my Netflix rule turns out to be too low, I can always increase the minimum and maximum values in 500 kbps increments until it works as desired.


Rest of article (Small Net Builder)

Linksys LRT224 detailed review

ZyWALL 110 detailed review

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