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Best way to keep web & email server 24x7 w/ DSL & 3rd party hosting company.

I have two internet connections for redundancy: 1 cable, 1 dsl. I also have a 3rd party hosting company. I would like to configure my connection so that minimally if my dsl connection is down (static ip), I can use the 3rd party hosting company to collect my emails and also display a basic web-site indicating our site is currently being worked on. I was thinking about running a secondary dns server on the 3rd party host with mx & a records for their server, and a primary dns server at our office with records pointing to our site in house? Not sure if the two dns would conflict as it would be for the same domain. I realize that the TTL would probably have to be 0.
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Thanks everyone! de11, your design is interesting and I will definately implement to utilize the redundancy of the connections. I am also concerned with a situation in which recently we have had very stormy weather.  At my parent's house lightening struck causing all electronics to go, and most importantly the phone and cable to be down. I am wondering how I would configure the dns so that there is a redundant web connection. Kinda like this (1) try dsl, if no dsl try (2) cable, if no cable refer visitors to third party host where they would receive a temporary notice we are down and the host would also collect emails.
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