Priority Setting with two separate DNS boxes working with one Xserve?

Hi Admins,
I am pondering over a DNS setup question here. There are 2 MacMini boxes, both running Mac OS X 10.6.2 server with the DNS services. Each of them are connected to two separate physical networks form two different ISPs. The key server ( Xserve ) is connected to the two ISPs through each of the ethernet interfaces. Once the boxes are live the traffic is always routed through the ISP # 2 ( originally a backup ISP and hence a lower bandwidth connection ) which times out the users and is very very slow. The primary ISP is the one with the higher bandwidth and needs the traffic routed through it at all times. Only when the ISP#1 is down, the ISP#2 should take over.
Is there a way to prioritize one over the other. Currently I have the ISP#2 DNS box offline as it will otherwise gain priority and website page loads, mail and other key services will suffer. The registry entry with the domain seller has two dns entries for the the above two boxes.

Is there a way to prioritize one over the other
Sure - at least if I understand the question. Just change the order of the interfaces in System Preferences -> Network -> (gear wheel) -> Set Service Order.
The interface nearest the top of the list will have priority, so set ISP1's link there. If that link goes down ISP2's link will automatically take over the traffic.
This doesn't account for how users get to your network, of course - users may still try to connect via ISP#1's IP address, but that's a whole different kettle of fish.
Note that this method is based purely on the link-level - as long as ISP#1's interface has a link the OS will prefer that link, even if the upstream connection is down. At that level your option is to have a script that periodically checks the ISP#1's link and changes the default route setting on the host to point to ISP#2's router address.

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Priority Setting with two separate DNS boxes working with one Xserve?

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