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Random Disconnects

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Hi, recently my computer's been having connection problems.

The connection will drop at random times during the day, and then come back on, but sometimes for only a few minutes. My mom thinks it's a hacker jacking our connection, but I can't be sure. It's frustrating my parents, because we have a Video on Demand service hooked up to the router, so no television.
We called our ISP and they said that there was no problem with our connection at their end, so we told them to come over here, and check it out. They checked the cables, and said that everything was alright, so they were no help at all. Resetting the router, and modem haven't helped. I've also done a virus scan and adware & spyware scan, but that didn't really change anything. I've come to you guys for help, because I've been surfing the forums, and saw that you've helped a ton of other people with their connections as well. Please help.

We're using a Motorola SB5101 SURFboard Cable Modem, and a Belkin F5D5231-4. The homepage for my router has a security log, so that might help.
I'm running Windows XP Home Edition, SP2.
Anything else I need to post, please say so. :]
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Logs from router can be helpfull.

Please observe few things:

1. Does router or modem restarts itself? It will be visible on devices lamps.

2. Run Start-->Run... "cmd"
Do it twice as you need 2 cmd windows.

first run command "ipconfig /all"


in one type "ping -t x.x.x.x" <-- Xes being IP address of your default gateway from previous command

in second windows type "ping -t y.y.y.y" <-- Ys being IP address of your Primary DNS server. If your primary DNS server is the same as default gateway then instead use "ping -t www.google.com"

Those commands will be sending constant echo requests to your router (first window) and to something behind it.
When network will get down check if both pings stops getting replies or just one.

If both are going down, then there is something wrong with your router. Try to upgrade its firmware to newest one (it's usually quite simple, but i don't know Belkin routers so you need to check it in manual). If it won't help replace your router.

If only one (second) ping will stop responding it is some problem between your router and your cable modem/provider. It may be simply faulty cable between modem and router, try to change it to new one.
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