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Intermittent Client Internet Connection

Hi All,

Does anybody know what would cause an intermittent client internet connection, whilst we know the connection is open and working? [ADSL]

The client loses all IP Packets to the ADSL box.

After a period of 10sec-2 mins the connection returns to that client PC.

Several other machines in the network lose the connection to the ADSL box whilst other machines keep the connection to the ADSL box.

This occurs with Win98/Win2000 Professional Clients.
[It only seems to affect a few key machines]

There are a few machine which can maintain an outgoing connection e.g. Servers/Client Machines which are also
configured in exactly the same way.

All name resolution/internet provider settings are given from DNS/DHCP/WINS automatically.

We are talking about a < 25 machine network.


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1 Solution

1) Get the newest NIC drivers for all machines.

2) Do a windowsupdate from the start button, and get any relevant updates.

3) Cleanup the background and startup programs.
In addition Cleanup the startup stuff. In win98/Win ME/Win XP -  Do a Start - Run - msconfig, startup Tab , or for win95 , NT or win2k,
Download the Startup COP a free pcmag utility from
 Run it and it will show you everything that is listed in all the possible startup
                        places, and allow you to disable things one at a time until the problem is eliminated.
 A lot of probelms are caused by excess old baggage - programs that have not been properly  un-installed. Startup Cop will eliminate leftovers and un-wanted programs that you no longer want.
Older Antivirus programs and Norton Utilities have been known to cause problems
try disabling them also !
4) Update or disable antivirus as a test.

danblakeAuthor Commented:
1) Believe it or not - no client problems with the machines is it affects several parts of the network.

It's amazing found a great guide on Troubleshooting TCP/IP problems in the Windows XP resouce Kit on Technet.  

After setting a few clients to static IP Addresses we found some interesting info -
This gave rise to a 'Router' command line utility.  We could diagnose 2 routers being present within our network resolving @ [For all unknown traffic destinations].
 1- Outside World Router
 2- Internal Gateway Address

We have removed the 1) Outside World Router address from the DHCP server for all client machines.  This has fixed the  problem for the mo but introduced one other.

The DHCP is now resolving the Gateway for Win 2000 Clients @ Primary Domain Controller Address [Not the correct adress of the gateway] - Unfortunate: but the client PC's still resolve and can keep an internet connection up and download 10Mb files +.

Does removing the outside world router present us with any potential problems as this is the change that has been made ?

Thanks ,




Only push out the absolute minimum.

Also watch the scope - Global vs local scope options.

You should have dhcp pass options 3,6,15,44,46 noramlly.

I hope this helps !

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