As you may know, SBS 2008 always wants to be the DHCP server in a domain. Not a problem, right? Well, if you have the Linksys WRTU54G-TM router from T-Mobile, it is a problem.

The issue is that even though you can go into the network setup on the router and disable DHCP, it never stops the service. This means that you now have two DHCP servers on one network giving conflicting addresses.

The Linksys WRTU54G-TM router from T-Mobile is absolutely necessary if you have “T-Mobile @Home“ phone service. This service allows you to connect a standard land-line phone to the router and have a pseudo-landline through T-Mobile. You have to put a SIM card in the router and as other routers don’t accept SIM cards, this is the only one that you can use with this service.

So my client needed this router AND he needed his new SBS server. Though it is possible to have the SBS stop serving DHCP, it isn’t recommended. Here is how I solved the problem of keeping the router for my client’s phone service while installing a new router for the network gateway.

1. I got him a new router to set up as the default gateway for the network and set the IP Subnet to 192.168.0.x.
2. I connected the server and all office computers to this router.
3. I then connected the old router, WRTU54G-TM, behind the new one and set it up with a different IP Subnet of 192.168.1.x.

This allowed both routers to be active while the primary network and its computers received their DHCP through the server. The phone service still worked and at the end of the day, everyone was happy. And next time I see a sys WRTU54G-TM, I’ll know exactly how to handle it. If I can’t remove it, I’ll simply make it subservient to another router.

Tim

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