Hey there,
My house mates, and I are having troubles with our internet connection at the moment.

It started about five days ago, the internet would cut at different times for different computers on the same network. These disconnections happen about every 20mins nd last between 10seconds to 10minutes, these disconnections happen to differnt computers at differnt times, so two people could be surfing the net while one disconnected or vice versa.

When the disconnections happen we can if we try to browse the internet it just comes up on the browser saying "Network Timeout"
When we are disconnected from the internet we can still ping/receive local traffic on our network. e.g transfer files.

So we came to the conclusion that it must be our router/modem dying, So we when out and got a brand new Belkin, plugged it in a put in all our settings, but its still have all the same problems as we had before, soo we replaced the line filter on our line, still the same thing. The router is showing crazy things in the log like:

11/29/2009 20:29:46 **UDP Flood Stop** (from ATM1 Inbound)
11/29/2009 20:29:45 **UDP flood** 76.204.98.157, 60063->> 192.168.1.105, 4778 (from ATM1 Inbound)
11/29/2009 21:12:56 **UDP Flood Stop** (from ATM1 Outbound)

This is when my house mate was pinging google to see if his connection was up or not

and

11/30/2009 11:09:22 User from 192.168.1.103 timed out

We thought it could be one of our network cards NIC's was damaged and flooding the router, so we checked everyone's sent/received packets which were of normal size, we also checked everyone's open ports which again was normal.

When then ran anti-virus/anti-spy ware on all our computers, which came up with nothing. Then the next step we took was to disconnect 2 out of the 3 people by unplugging them from the router, to see if it was anyone's pc that was affecting us all, the same problems happened to everyone when the other 2 computers where not plugged in.

We are completely stumped, Ive been running Wireshark on our connection and I can link anyone that would like to see what happens when the connection goes down... I cant make sense of what its showing me, but maybe someone else can.

Any and all help and comments would be greatly appreciated,

Thank you for your time,
Julznova

Did you contact your ISP? With everything you did, I would suspect the incoming line. They can test it from their end.

Hey I have, The router still holds a connection to the internet/ISP when these problems occur, the ISP can see no disconnection from us.

Also I've just been looking into this a bit further, when the internet connection goes down, I can ping a website like google.com... it resolves the IP then all the packets sent time out, this implys that I can connect to my ISP's DNS but no further...

And this is a combination modem and router in one box? Anyway to bypass the router and connect with one PC directly to the modem?

Nevermind. you must have been typing while I was.

Its a Router/modem in one, there is no way to dypass it, as It is just one box. We use Ethernet cables, we have tyred different Ethernet cables to different PC's and the same things still keep occurring

It is not likely all 3 computers developed the same problem all at once, unless malware is involved.

And since you replaced the modem/router, then that would seem to rule that out. I would still suspect the lines. Can you connect to another point? How are you posting here?

Our connection goes up and down, and no we cannot connect to another point. Sometimes the net will be up for about 20mins then go down for anywhere from 10seconds to 20minutes... we have started to reset the router when the connection goes down... and some times it solves the problem, until it disconnects again

Have you had a lot of rain lately? High winds (if above ground cables)?

Perhaps when you go to bed tonight, power down and unplug everything and leave it that way until tomorrow. Then connect just the modem and wait for the LEDs to stabilize. Then one at a time, bring the computers on line. I don't know your ISPs policies, but they may re-authenticate if connection is lost for more than a few minutes.

Is this DSL or cable?

Yes we have had high winds and a lot of rain lately, the cables are above ground, I will do what you suggested , and its DSL. btw thank you very much for your help guys.. I hope this works lol