Bypassing router

I know this isn't robotics related but since I am a news cameraguy that has covered the competitions in Toronto I figured and know there is probably enough brain power here to help me figure this out.

I have a Rogers Extreme hi-speed cable modem, a D-link EBR-2310 router and a PC (T60 thinkpad, 4G ram, Core2duo), and a macbook connected to it, there is also another computer connected to the router that someone else is using...I got suckered into sharing.

My T60 is now running Vista Ultimate with no problems at all
Mac runs Lepeord

Now, I use Ipswitch-pro WS_ftp pro to upload news video to one of the stations I shoot for and everything worked fine for a full year and then one day file uploads started failing, the upload starts and then just stops. Now when the FTP stops the internet connection is still OK as I can use the browser and all that no problem.

I did check with my ISP and they are not throttling FTP port 21.

Reset, restarted and rebooted everything, did as much trouble shooting as possible and the engineers at the TV station spend some time with my T60 making sure all the settings were ok for their server and they were fine.

When I upload with my PC or MAC plugged directly into the modem 9 out of 10 times it works fine but it appears the trouble happens when going through the router.

So I think what I am looking for is step by step advice on how to bypass the router, set up the DMZ and all that because I don't think I have done it correctly.

I thought I did but last night I sent two files from the MAC and woke up at 3am only to find "data connection lost", so I plugged the mac directly into the modem and resent the files and they went through fine.

These files by the way are 500mb to 1.2G, as they are broadcast quality video .avi's.

Right now my router is the prime suspect.

What gets me is this worked fine for the longest time, the problem did start while I was running XP-pro and continues under Vista and also the uploads stall out on the little mac book.

I'm sure the problem is simple and right under my nose but with working 14 hour shifts in news there are not too many functioning brain cells at the end of the day believe me

Any advice would be appreciated and I look forward hopefully to being one of the news cameras once again covering the competitions in Ontario in 2008.

If it is a complex problem I would be willing to pay for the technical advice, that's not a problem, I can also enable remote assistance.

thanks again
Mark Rozitis -ENG news camera (Sony XD HDcam)
stormcentre@rogers.blackberry.net