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Windows XP dial-up freezes machine

Posted on 2009-05-05
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Last Modified: 2012-05-06
So I have this pc which is on my LAN, which works fine until I run this dialup connection to one of our clients to upload some EPG files to an FTP server. As soon as I disconnect the dialup the machine is fine, but when dialed-up it will freeze. Any ideas?
The machine is a normal domain client and so it is attache my AD, and works fine otherwise.

Windows Xp pro sp2
attached to domain
running ftp client and dialup to client site.
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Question by:_Negal
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by:flubbster
ID: 24304289
Go to: Control Panel: Network and Internet Connections: Network Connections
Right click "Local Area Connection", choose "Properties"
In the General tab, look in the box that says, "This connection uses the following items:"
Look for Microsoft TCP/IP version 6. If it is there select it, uncheck it, then click on the "Uninstall" button.
It may take some time to do it, but when it is done, it will prompt you to restart your computer.  Do so.

Test

This version is very problematic and is installed as part of an update. You are MUCH better off using the original TCP/IP that comes with standard XP install.
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Expert Comment

by:MrJesse34
ID: 24304797
If the suggestion above doesn't work, you would do best to download the most updated HARDWARE drivers for your modem.  It sounds like your driver is acting up.
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Author Comment

by:_Negal
ID: 24304899
Flubbster, thanks for the prompt reply. I checked and I am not running TCP/IP version 6 at all. It is not installed.
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Author Comment

by:_Negal
ID: 24483820
OK, I now have norrowed this down to the fact I am using combination of dial-up networking and network cards for LAN.

Therefore, the machine locks up when I have dialed-up to the client site to try and upload FTP files, and the reason is due to the use of the default gateway. Meaning because my LAN card already has a default gateway to internal LAN, when I then dial up to the FTP site, I will then be assigned a new dynamic IP and new default gateway for the DUN. Whats then happening is that all packets will be routed through the dialup, not to the internal network or internal router. Hence, why when I try to browse my computer for the FTP source upload network drive the system locks up trying to figure out where the local LAN packets should go. I know this, because as soon as I disconnect the machine is back to normal. Furthermore, if I untick the option "use deafult gateway on remote network", I can dialup without the system locking up and I have full access to local LAN resources. However, I am unable to reach the FTP upload server, because there is no gateway to route packets to the dialup FTP network.

I kinda figured out the answer lies in the routing table. However, I also found out the dialup gateway assigned to my dialup interface is dynamic and changes every so often, and so it will not be a simple case of addinig a persistant route in there for the dialup. In fact, I can see the default wateway getting hijacked as soon as I dialup and then run "route /print". So I am not sure what other options I got here. Any ideas?

Perhaps there is a way to run a script to pickup gateway and ip for a specific interface and add to route table on the fly. Any ideas would be grately appreciated.
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Accepted Solution

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_Negal earned 0 total points
ID: 24544775
For anyone with similar challenge that might come across this thread, a little bit of logical thinking got me through this one. I managed to achieve what I needed to do by adding persistant route in the route table, which would force 192.x.x.x. packets destined for the local LAN through the LAN nic intercace whilst dialed up. This worked a treat.

route -p add 192.0.0.0 MASK 255.0.0.0 192.168.1.1 IF 0x2

Thanks all.
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