Setting any static IP causes slowdown

Ultimate Windows 7 ultimate 32-bit
August 15, 2011 at 23:56:29
Specs: Windows 7, E8400, 4GB
I have a Cisco DPC3825 modem/router for my Broadband 50 internet from Shaw.
I'm having problems setting up the static IP for the thing though.

If I leave everything dynamic my internet speed is blazing fast(close to the claimed 50 mbps), webpages load really fast and speedtest confirms the speed.
However if I set even 1 static IP in the router, my lan lined PC's speed would be gone, replaced by very slow speed browsing and most of the time it'll just cut out completely(saying server not found wherever I try to go). Wifi devices seem to retain their high speed just fine.

It didn't seem to matter if I try to set a static IP for my lan lined PC, or any of my wifi devices. as soon as there's even 1 static IP set, the lan speed just dies out. (I can't even connect to speedtest)

Without static IP, I won't be able to port forward for my gaming and torrents and such, which sucks.

anyone got any idea or advice?

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August 16, 2011 at 03:47:32
You should not need to set a static IP address. Most routers will allow an IP address that has been set by port forwarding to be be reserved. That means that the IP address is permanently linked via the computers MAC address even though it is still a dynamic address.

I have used port forwarding many times on many different routers and never had the need to set a static IP address.


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August 18, 2011 at 14:46:59
You present an unusual case StewartS.

Not only do many many router manuals tell you to either do a ip reservation [dhcp assigns the static ip] or set a static ip on the workstation not in the dhcp scope but so do many port forwarding how tos.

amazingmao have you made sure the ip address you are statically assigning is out of the dhcp scope range?
Only way I can see what you describe happening is if you are assigning a pc the same ip as the gateway ip. This of course would cause a ip conflict

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