Network Setting changing from Work Domain to outside T1

Hi,
I have a computer at work that logs into the domain MTSD.  While in the MTSD domain the computer is protected/restricted by our firewall.  I now have an outside line(T1) that is unrestricted and with no firewall because it does not go through our network, but when I hook it up to my computer it says limited or no connectivity.  I am sure it is a network setting or has something to do with the computer looking for the domain MTSD.

I guess I can keep the computer as is and switch patch cables when I need to get around the firewall (not often) but what setting would have to be changed to get this to work?  I am currently set to automatically obtain IP etc.

The other option is to keep it hooked up to the T1 line all the time but how would I be able access my MTSD network?  This would also leave me unprotected by emiminating our filter.
jdolan2587Asked:
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Michael FrederickRegional IT Manager IIICommented:
"but when I hook it up to my computer it says limited or no connectivity"
You answered this with your question. The T1 connection is not suppling your machine an IP and since your machine is looking for a DHCP server you are getting this error. How are you connecting this T1 connection to your machine? T1 -> Router -> Computer? or?

I guess my question is what are you trying to accomplish here?
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jdolan2587Author Commented:
The primary purpose of the T1 line is for our videoconferencing unit.  Since I sometime use a computer in conjunction with the video conference unit, it is handy to circumvent the firewall for large downloads, restricted but appropriate sites and videoconferences using a webcam instead of our expensive unit.

The Polycom videoconference unit has a fixed IP address.

I guess I thought I would be able to just unplug the patch cable from my VC unit when it is not being used and simply plug it into my computer.
 
Another way I can hookup my computer is to use the Polycom unit essentially as a pass-through.  The T1 patch cable goes into the VC unit and then I can plug another patch cable from the unit to my computer.

This worked in the past when everything was in the MTSD domain. Now that the T1 line is not in the domain the pass-through feature does not work.

As you eluded to it all revolves around the IP address and possibly the domain????
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jdolan2587Author Commented:
I think I solved it myself.  I had to add all of the DNS, gateway info etc.
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