W2K3 Dual Nic and 2 ISPs

I am in the process of switching ISP providers and doing a cut over.
I have 3 web servers that sit directly on the Internet (yeah, I know!!
separate topic for a different thread). Anyway, point is, I do not
have a router in front of this to provide communication to both
networks and handle it that way.

Instead, what I am trying to do is allow access to the web servers
from both networks (each ISP) in the process of transition. We are
not talking about a long duration but probably about a week. I want
to switch DNS, let it replicate but still allow the old network from
ISP1 to continue to respond properly and then eventually finish the
cutover to ISP2 and unplug the ISP1.

Can anyone tell me how to configure my 3 W2K3 servers in order to
accomplish this?

None of the servers are DCs or in a domain. They are standard
standalone servers.

I know you cannot have a gateway specified on the second nic, but if I
configure everything else (IP Addresses, Subnets) for ISP2 and then
configure IIS to respond to either or and then change DNS, will this
cause issues with traffic confusion? What is the best way to approach
this problem?

Thanks,

Kalvin
.

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