Go Back   Cyber Tech Help Support Forums > Hardware > Networking

Notices

Reply
 
Topic Tools
  #1  
Old May 9th, 2007, 06:19 AM
megahertz100 megahertz100 is offline
New Member
 
Join Date: Mar 2007
Posts: 9
Rogue laptop knocks users off the network

This message is a little long since I want to explain a lot, but I think you'll find this problem intriguing.

Harry has a laptop running XP Home, SP2.

When he plugs into our network, one or two users loose their network connection (no internet, email, remote printing or server access).

Ipconfig shows that their machines are now "joined" to the mshome network and the default gateway is now Harry (192.168.0.32) instead of the router (192.168.0.1).

DHCP is provided from the router, which is a Linksys WRTG54G, with the latest firmware.

ipconfig /release and renew sometimes fixes the problem, a reboot generally fixes it although sometimes multiple reboots are required.

Yesterday was an extreme case when at least 8 users lost connectivity.

Harry has no problems when this happens and I don't see anything strange in his event logs.

Win2k as well as XP Pro machines seem to be affected, including power users, admins.....it seems to be random.

All our machines have the latest updates, patches, anti-virus, anti-spyware etc.

This all started quite recently but Harry has been using the same laptop for years.

Any suggestions?
Thanks,
Reply With Quote


  #2  
Old May 9th, 2007, 08:56 PM
z1p's Avatar
z1p z1p is offline
Cyber Tech Help Moderator
 
Join Date: Oct 2004
O/S: Windows Vista 64-bit
Location: Massachusetts
Posts: 6,668
Are you using domains or a workgroup at work?
Do you have UPnP enabled?
Reply With Quote
  #3  
Old May 9th, 2007, 09:47 PM
megahertz100 megahertz100 is offline
New Member
 
Join Date: Mar 2007
Posts: 9
A domain with (15) machines (all Win2000, SP4) and a workgroup with (2) WinXP Home SP2 desktops and (4) WinXP Pro SP2 laptops.

UPnP is disabled in the router.
Thanks,
Reply With Quote
  #4  
Old May 9th, 2007, 10:28 PM
z1p's Avatar
z1p z1p is offline
Cyber Tech Help Moderator
 
Join Date: Oct 2004
O/S: Windows Vista 64-bit
Location: Massachusetts
Posts: 6,668
Do you have SSDP enabled on the PCs? I wonder if the rogue laptop is advertising itself as a Router. Does the rouge laptop have UPnP service running?
Reply With Quote
Reply

Bookmarks

Topic Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




All times are GMT +1. The time now is 08:51 AM.