Multiple ISP LAN networks attached to the sam

August 8, 2009 at 03:48:03
Specs: Windows
I have two computers that are connected to a LAN switch
The switch itself is connected to two different ISPs.
The computers are windows and are both setup to dynamically get IP address from DHCP. One is registered by MAC address to the first ISP, the other to the second.
My question is - is this setup possible?
Can the two computers properly get their IP address and network settings? Or some kind of race condition can occur between the different DHCP servers of the two ISPs?

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August 8, 2009 at 04:54:43
First why not tell us whether or not what you have setup actually works - never mind the "is this setup possible" question.


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August 8, 2009 at 05:37:07
Maybe it was not clear, sorry, this setup is hypotetical. I would very much like to know if that would work, before I actually see it not working :) And what can be done about it.

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August 8, 2009 at 05:49:25
The bigger question is, why would you want to do this?

If they're separate LAN's using separate ISP's then get two SOHO router's and use one per LAN/ISP.

You're idea is just a problem waiting to happen, assuming you could even get it to work properly at the outset.

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August 8, 2009 at 06:08:58
I cannot use two soho routers. In order to understand I need to explain the whole setup and this is quite complex. It involves virtual box setup with bridged networking, every virtual OS (guest) mush have its own IP (real internet) with different ISP, but they all go through a single LAN card on the host that is bridged to a virtual interfaces (lan cards) on each virtual OS. The lan card connects to a switch and in that switch the cables of the different ISP go. And they can be more than 2. A lot more. One solutions that will work is I put more lan cards on the host and use each one for each virtual OS. But you can have so many lan cards.

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