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What model of ADSL modem/router by major market brand can be used to install some distro of Linux to setup a watchdog to initialize connection by demand in case for example of main internet connection fail? Probably using C#/mono.

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How about something like a Draytek 2820 or 2930 that supports 2 WAN connections with failover or can failover automatically to a 3G connection?

If you do want a DIY solution, have a look at this wiki page over at dd-wrt

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Thanks! What is the different between dd-WRT and OpenWRT? – abatishchev Sep 15 '10 at 17:01
btw, my main channel is high-speed ethernet and a reserve one - low-speed adsl – abatishchev Sep 15 '10 at 17:02

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