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Originally Posted by James Henry
I love it when people flash their certifications 
Firstly your CPE IP, be it your router or a PC connected directly to the modem, is completely irrelevant to the speed that your connection runs at. The throttling is actually based on the MAC address of your cable modem so it's not at IP level at all. BY support are dead right on this issue so you may want to wind your neck in a little while you are accusing them of knowing nothing for telling you this.
Secondly flashing an MCSE, even one dual certified, doesn't really impress. While I'm sure it equips you to fix Microsoft servers for WANs it's like me saying a CCIE equips me to bake fine pastries. MCSE is a Microsoft Certification and MS don't produce products for Wide Area Networking and certainly not anything relating to cable modems.
I blame your router at first glance to be honest. I imagine that for someone of your experience the fact that the service runs fine without the router then runs slowly with the router makes it pretty obvious where the issue is most likely to be, namely with the one component that has changed. Check the duplex settings on the LAN side, the speed of the port on the WAN side, and the capabilities of the unit as a whole.
Remember you must always reboot the cable modem when changing the device you are connecting to it in order to clear its' ARP cache.
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So support are dead right in saying switch off everything for 3 days? I ain't winding in jack mate! Especially me neck!
And in anycase you have an incorrect perspective about people with MS credentials. Qualified to fix Servers..
Oh, sorry I didn't tell you I was a CCNP as well, may have made you cuss some more... even though the certification may be more relevant although not affilited to cable modems!
Flushing the local ARP cache isn't doing f' all... Do you know why I am getting the same IP 82.45.x.x when I connect the router to the cable modem? This is the case which I suspect is causing the problem as I already stated that even when the cable modem is connected to the PC and is using this IP 82.45.x.x is still runs at 4MB. However, it's only until i reboot the cable modem it assigns the PC an 82.35.254.x address which in turn gives me a 10MB connection...
Hence the fustration!