Hi, I realize this is a half year old post, but thought I'd jump in. At my parents house I have two DSL circuits using the lowest rated internet/phone company in the nation "Frontier communications" on DSL1 we get about 4mbit/.5mbit and DSL2 we get 5mbit/1mbit. We have a Dahua (OEM brand sold as Q-See, EyeSurv and some others) NVR (network video recorder). This is an IP camera based server is connected to (18) 2MP and 3MP cameras. Not just on their local LAN, but 4 cameras on our farm, 2 cameras at my house, and 2 camers at my uncles house (I know that sounds weird, but think of it as kind of a family based neighborhood watch program, we can see each others front yards to both watch out for each other <aka Did you make it home safe type thing> and make sure there is no criminal activity). This also provides offsite backup, so if a thief breaks into one of our homes, the other NVRs have a record of it..
But I didn't come here to post about IP camera systems. I was actually describing that to say -- we use a TON of constant internet bandwidth, and the way I have it setup actually, is that I pull the video streams from everyone then repeat it back out, so source sites like the farm that are fed by a wireless ISP, only have one of us pulling from them, then the others pull from me -- I configured it this way because I have fiber to the hub fed VDSL2+ -- 50mbit down, 20mbit up. Whereas they don't. That brings me to my point, when I got my parents the 2nd DSL line, all I basically did was turn off DHCP in the 2nd modem and put it into the network. But that brings a whole host of limitations that I wasn't smart enough to overcome. So I bought a
TP-Link TL-ER5120 5-port Gigabit Multi-WAN Load Balance Router - I plugged both DSL lines into it, set it for both Load Balance and Failover functionality, then setup virtual port forwarding for each WAN port, along with a preference for most all the common latency sensitive functions like web browsing, playing videos, Skype, etc to run over port 1 mostly along with a higher QoS setting than the IP camera video streaming.
In your case the only benefit for dual WANs would likely be if you used a second ISP. For example a cable modem. That way you not only had a sweet 50mbit speed, you'd have a load balancer adding the speed from the cable modem on top of it, and one of the connections taking over.
By coincidence, I'm actually installing Ubiquiti 5ghz wireless bridge to a friends house 4 miles away who lives in town with a 50mbit cable internet account. Out of sheer luck my parents live up on a hill and have a clean line of site to my friends house. So the TP-Link LB Router is going to have its 3rd WAN set to accept this incoming connection from town so my parents will have a 3rd connection. By itself 4.3 times faster than their TWO dsl connections. So finally we'll be able to stream more of our remote cameras at a higher frame rate.
If I were you, and you wanted even more speed -- Call your ISP and ask them how much it would be for an extra dry line DSL account. For my parents, the first connection is $49/mo and the second one is $20. If you tell them you just want it as a backup line, sometimes you can talk them into providing it on the cheap. Then get one of these excellently priced routers and bingo, you are nearing the 100mbit range.
Sorry for the long post, it was only somewhat related to your question, but it made me think of how I handled multiple DSL services and now a 3rd based on cable and thought I'd share.
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