How do a setup a computer two act as a router

September 14, 2010 at 12:48:16
Specs: Windows 2008 R2
I have multiple servers to configure. One subnet is on x.x.10.x and the other is on x.x.11.x. There is a 2008 R2 DC/DNS/SQL/Web on one and the other will have a RODC/DNS/SQL/Web. Ultimately, x.x.11.x will be a failover site for x.x.10.x. The problem is that I do not have my router yet. I have a switch with everything plugged into it. I do not want to get into re-IP'ing a DC/DNS, etc once the router comes in. Even then it would be to simulate the remote site with the router until the other site is up and functioning. A possibility would be to change my mask on all the servers to encompass both subnets, but would this cause any problems down the road once I change it back to a 255.255.255.0? Any other suggestions?

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#1
September 14, 2010 at 13:04:12
192.168.10.0 with 255.255.254.0 will give you 510 hosts with a range of 192.168.10.0 - 192.168.11.255

Supernetting requires no router.

Unless these are two different physical sites there is no failover using subnets. You would not need a router at all if this is the same physical site.

To answer the subject line web search Internet Connection Sharing. A xp workstation would need two nics.


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#2
September 14, 2010 at 13:26:58
It is currently one site. I have all the hardware at this site except the router for this site and the other site. It will ultimately be two sites with BGP4 on the two routers.

If I change the mask on the layer-3 switch to 255.255.254.0, wouldn't this accomplish what I am trying to do?


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#3
September 14, 2010 at 13:47:50
If you have the same subnet in each lan I don't see how you could route traffic between them. IP request wouldn't hit the gateway because it would be seen as local only. So no I don't believe you can supernet then put each system in different physical locations unless you bridged between the locations.

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#4
September 15, 2010 at 06:10:40
My original question: A possibility would be to change my mask on all the servers to encompass both subnets, but would this cause any problems down the road once I change it back to a 255.255.255.0? Any other suggestions?

My solution is to change the mask on the all the servers. I will set the mask to 254.0 that way no routing has to be done for 10.x to talk to 11.x. When I get the router and the other site up, its just a matter of changing the mask back to 255.0. The biggest benefit here is that I do not have to go through any IP changes for DNS / DHCP / DC's etc. Its just a quick mask change.


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