Broadband router - Netgear dg834
Network - Windows 2000 Server Sp4 network with various workstations.
Broadband - Griffin Internet Various speeds on a BT phone line.
Ok heres the problem I have with a couple of sites. (not too sure if I have placed the question in the right area though?)
They have a main site and a branch site. Now the branch sites can connect over VNC\term services 24\7 to the main site- they have absolutley no problems with there connection to the main site or using there own internet. The problem is with the main site. When anyone on the network tries to browse the internet 9 times out of 10 it fails. As if it can't see the internet. There are no virus’s on site and the network is running on fast procurve switches. (even tried PC's directly into the router). I have tried changing the mtu settings on the router and client network cards but no luck. The DG834 router has the latest firmware and the network cards the latest drivers. IE is the latest version and it happens on anything from windows 98 – windows xp or windows 2000 server. Other intenet access programs like Symantec Live update also won't work 9 times out of 10.
I did think noise on the line could be a problem. On 1 site the noise is 54 with a noise margin of 15. On the other the noise is 26 with a noise margin of 35. The first site were on a 2mb 20:1 line so I dropped it down to a 1mb line as I have heard high line noise can cause problems with high speed. Both are on 1mb 20:1 now. I have had BT engineers out to check the line over and they can't decrease the noise. I have set the server and workstations with the primary dns server as the broadband router IP so it looks ahead of the main 2000 DNS server. They have been having this problem since the install date. I have been absolutely pulling my hair out on this one. The broadband line and broadband router must be working ok as the remote site can connect in ok. Its like the upload is ok and the download isn't.
Then yesterday I stumbled on something that seems to have sorted the problem but is very risky. In the netgear managment software there is a "router status" section and in that there is a "connection status" box. If you click on this you get the current connection status e.g line noise and data amounts transmitted and other misc info. By default the window polls for new info to refresh the box with every 5 seconds. Now if I leave this in screen on both sites the broadband works fully all of the time. I really can't imagine whats happening here? I don't like the idea of leaving the broadband router management screen open but I can't find another way. I have never had this problem on other sites. Can anyone PLEASE help me on this one?