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Cable w/ DSL backup...switching back and forth

I just started working out of my home and need a constant internet connection for trading applications. I have both Cable and DSL service (at least I'm supposed to have DSL working soon).

Queston: What is the best way to handle these connections so that it will be easy to switch the feed into a particular computer?

I will be running one computer w/ 3 screens and another computer w/ one screen at all times. My cable connection is very fast so I plan to run my primary computer off it (3 screens) and the secondary machine off the DSL. That way I take advantage of my bandwidth from both services and also will know that both services are in fact working on a daily basis (A backup is no good if I switch over only to find it's been dead for days right!).

One other possible issue is I must login to a remote server using a RSA SecurID key fob on the 3 screen computer. So when I switch over I don't think there is anyway to avoid having to re-log in w/ the key fob code.

Anyway...what ideas are out there on the best setup solution? Just add a 2nd NIC card for the DSL ethernet connection? Anything better?

Thanks!

**Sorry for double posting this in the 'Broadband' forum, but thought this may be the better place to post.

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