On May 15, 2011, at 10:24 PM, John Robinson wrote: > As a redundancy for data I have three different network servers one is DSL, > one is Cable, one is Satellite. I can change the network by using Wireless > but I have them each set up with ethernet cable so to then change networks I > have to plug a different ethernet cable into whichever computer I am > currently working (not a network server rather a regular Mac). > > What would happen if I had each of the three network servers coming into a > switch and from the switch one cable to the computer? Would I end up with a > super fast internet connection or would I have a nuclear meltdown? > > I assume this would cause tons of headaches, but if not then how would I > change networks since they are each on ethernet, no ethernet "baseball" > diamond to choose from as with Wireless. > > If anyone knows what I would be in for I would appreciate your suggestions.
I have had a little experience setting up such an animal with two ISPs. I helped out a person who had a dial-up and satellite setup. What you need is some advanced router-fu. I did it with a Linux box and three Ethernet cards. Two were connected to the external networks and the third was on the inside network. There are many options for the ways the traffic can be split. I used the suggestions from the Linux Advanced Routing documentation. The Linux IP docs were also useful. Of course, this is kind of like reinventing the wheel. Cisco makes routers designed for handling multiple ISPs. I know some of Cisco's 1700 series routers can do multihoming, and they're under $300 these days. Cisco probably has even better ones, since the 1721 I played with is now over five years old.
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