dorlow

How far apart are the buildings? Are they next to eachother or a block or two apart? If they're relatively close, you just need to string a wire from one building to another building. The company I work for does stuff like that all the time. There's certain right ways to do it. I'm not the wiring guy. But it will be a point-to-point similar to the T1... but unlike the T1 where the CO owns it, this new wire you'll string, you'll own the wire. So, there will be no public IP at all. It will all be internal IPs going over that wire. It will be logically just coming off one switch port in the building that has the T1 and going into the other building into another switch. Your best bet would be to VLAN the first switch and use sub-interface on your router so you can route beween VLAN1 and the VLAN you're going to put the one port that's going to go to the other building. Then setup your router to route between the two VLANs. Do some research on Cisco routers and sub interfaces and VLANs. You can VLAN a switch so the switch thinks it's multiple smaller switches. Then you can assign a sub interface of the router to those VLANed switched ports. Then you can setup a routing protocol, such as IGRP or OSPF to route between those sub-interfaces and do exactly what you want to do. Here's some information for you... Subinterface - Wikipedia, the free encyclopedia Really, what you should do is post this question to a Cisco Networking forum. I took my Cisco classes about 7 years ago and I haven't really touched Cisco since. I'm Windows server guy now, so this isn't my specialty. I know it's possible because I've done it, but it's been a while since I've looked into exactly how to make it work.

A T1 is basically a straight through CAT5, when thinking about it in simple terms. I don't know if you've ever experimented with sending 2 subnets over a CAT5, but it works. You really can send as many subnets over a cat5 as you have of ports on a switch on each side of the CAT5. You can have one PC on one subnet and it will talk to the PC on the same subnet on the otherside of the cable. Then on the two sides, put another PC on another subnet and put another PC on the otherside of the cable on that same subnet and the second two sets of PCs could talk. But subnet1 PCs and subnet2 PCs would have no way of communicating with eachother without a router that could route between the two subnets. So, if you have it setup with your two buildings so they're on seperate subnets, I don't see why you couldn't have a switch on the headend and a switch on the far end. Then you'd have to have a router on the head-end that would route between the original T1 subnet and the DSL subnet but both subnets would be riding over the same T1 line now. I guess I never did anything like this with a router. I have setup two subnets on one CAT 5. More I'm thinking about it, the routes are going to get weird with both routes being on the same port. But most routers, you can specify the source network, destination network and then the next hop far end IP. So, I'd try setting it up. You would have legit next hop IPs. They'd both be on the far end of the same T1, but the router doesn't need to know or care.

You could do like what I do for my home TV. I'm cheap so I don't want to pay for DVR service. I setup Windows Media Center on one PC. I have a HD TV Tuner card in the PC. I hooked it up to the TV next to it using a VGA cable and a mini plug audio cable. It worked nice, but then I got to thinking, it would be nice if I could watch our recorded shows on our bedroom TV. So, what I did was hook up another laptop to our bedroom TV. Then I hooked up the two TV PCs together via CAT5. (I first tried it wireless. Turns out wireless G is too slow for HD video.) Then I went into the Windows Media Center and added the UNC path of the recorded TV shows on the other PC (that I already shared out) to the Windows Media Center on the remote PC. Now when I go into recorded shows on the PC upstairs, I see the recorded shows the downstairs PC recorded. Just to let you know, I first tried using Windows Vista. It worked OK. But Windows 7's Media Center has a much more polished feel that feels like you're using a real DVR system.