ADSL / router slowed Network copying ? help ?

I have 5 computers on a small network: 3 Macs (OS 9.2.2) and 2 Windows PCs and a networked printer connected using a 8 port switching Hub. The PCs are accessed using Dave's Network 6 on Mac (3) . Each computer and the printer has its own TCP/IP address.
I recently subscribed to Telus ADSL internet following the prompts on their CD. The Internet Mac (1) is isolated by a DLink DI-604 4 port router as the network firewall. I set up the DLink DI-604 according to its instructions.
It worked, I could access the internet and share files between the Macs, except copying files between the Internet Mac (1) and the other 2 Macs was very slow, any file over 300k would take 9 minutes, larger files above that might take 20 minutes or longer.
Copying between the other Macs (2 and 3) is ok.
I removed the Dlink Di-604, reset TCP/IP to local file sharing via TCP/IP and put the network back to where it was before this fiasco started.
Sharing files between the Macs is fine except copying files between the Internet Mac (1) and the other 2 Macs is still very slow, files larger than 500k result in long delays.
The files arrive on the receiving Macs in reasonably prompt fashion, but the sending Internet Mac (1) File Copying Window seems to freeze up in a 15 minute delay.
This project got very complex very quickly, if you have any ideas or suggestions please advise as trying to get any work done is very difficult.
Power Mac G4 350 Mac OS 9.2.x

Hopefully fixed problem myself
I made careful note of the TCP/IP settings and BRAVELY chucked out all the Telus internet stuff I could find.
Copying between Macs still didint work.
So I re-installed the OS 9.2.2 software from CD disk. SUCCESS copying is now working !!
It seems the Phone company's (Telus) supplied CD software wrecked my Mac's operating system. Telus claims they are aware of the problem (but they probably didnt want to confuse potential customers with scary stories)
You have been warned

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    Hi Corrado,
    Welcome to the Apple Discussion Forum.
    To use iChat with your router you will need to open the necessary ports on the router.
    Please have a look at the following:
    Ralph Johns (UK), "How can I get my router to work with iChat?", 02:09pm Aug 23, 2004 CDT
    http://www.portforward.com/routers.htm
    Hope it helps
    Chris

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