Answer to 1)
Similar to you, I wanted a backup internet provider.
So I started looking and found that over the last few years many network equipment companies stopped making Dual WAN routers for the small business.
I found only 3 manufactures which I could easily buy:
- Cisco: 4 Port VPN Dual WAN. It is actually a Linksys router. I was not to happy with the Linksys equipment. Other people had negative comments too (I know don't believe anything on the internet...but like I said, was not too happy with my former Linksys equipment). But the price of this device is good.
- ZyXEL ZyWALL: Could not find too much user comments on this device, and did not like their website.
- Peplink: Also had problems finding a lot of user comments on the device. I have a friend from Asia and he said that Peplink has a good reputation there.
I finally found this review and decided to go for it:
http://wordpressexpert.net/matt-peplink-multi-wan-routers/
This was over half a year ago...I believe there is also a dual WAN Router from Netgear available, which normally builds fine networking devices.
Answer to 2)
20.
Reason: see the link I posted in the review above. Plus the price.
Answer to 3)
Disclaimer: I am not a network expert...so don't just take my word for it.
I am not sure if this is possible, since you connect via 2 different providers to the internet, which have 2 different IP addresses assigned to you. The router will take one internet provider for the whole time you are connected to your broker. Once this internet provider goes down, the router will switch to the other internet provider. This means that you have to reconnect to the other server with a different IP since you are now coming from a different network. If you are in an authenticated session (i.e.: on a rate server where you have to provide username/password), you might have to re-enter your credentials. If your software has all your credentials saved, it might reconnect to the server via the 2nd internet provider automatically without you noticing. But it depends on your software and setup.
I built an automated trading system which will automatically reconnect once it loses the connection, so the scenario with the internet provider switchover has been covered.