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LAN says connected but can't see router or internet


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8 replies to this topic

#1 Finsteigle

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Posted 20 February 2010 - 01:22 PM

I have a home network connected via a Router/Modem which works absolutely fine for everyone in the household in all respects except once a day my personal PC drops LAN connection and the only way I can get it to reconnect is by restarting the PC.

This is an XP Home Edition PC with a PCI network card wired to the router. I was intially using an older card (Realtek 8139D) but I always had doubts about the drivers, so when this problem started happening I purchased a new Belkin Gigabit card assuming that this would solve the problem. It hasn't made any difference though.

I also have downloaded the latest drivers for the Belkin but still no change.

The strange thing is that the LAN connection and Internet connection tray icons are present and indicate connected status, yet I cannot reach the router at 192.168.1.1

Router seems to be working fine and there is no problem with the other PCs on the network. All the PCs on the network are set to obtain IP address automatically.

I can use the automatic Repair option by right clicking the LAN icon but although this seems to successfully complete and the LAN icon returns to 'connected' status I still can't connect to the router screen or internet.

I have tried releasing and renewing IP lease at the command prompt but this does not fix the problem.

Turning the router on and off does not fix the problem.

Unplugging the ethernet cable for a few mins does not fix the problem

Disabling and re-enabling the network card does not fix the problem (although the Internet tray icon does disappear)

Having trawled the Internet for solutions there were suggestions that unselecting QoS and IPv6 in the adapter properties might solve the problem. I have left these unselected, which does not appear to be adversely affecting my connection (when it is working), but has not solved the problem either!

The only thing that fixes this is restarting the PC.

Does anyone have any ideas?

See below my ipconfig /all

Microsoft Windows XP [Version 5.1.2600]
Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Charles & Jackie>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : DadsPC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Belkin 1Gb LAN Card:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Belkin F5D5005 v2000 Gigabit Desktop PCI Card
Physical Address. . . . . . . . . : 00-17-3F-D0-72-4A
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.105
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 62.24.139.6
62.24.139.7
Lease Obtained. . . . . . . . . . : 20 February 2010 17:04:13
Lease Expires . . . . . . . . . . : 21 February 2010 17:04:13

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : FF-FF-FF-FF-FF-FF-FF-FF
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : ?
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled

Edited by Finsteigle, 20 February 2010 - 05:17 PM.


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#2 Desion

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Posted 21 February 2010 - 12:03 AM

Whenever your computer cannot connect to the router / internet, are you able to ping the router? modem?

How to Ping:

1. Open up Command Prompt
2. Type in "Ping 192.168.1.1" and hit enter.

The results should show Sent=4 Recieved=4 Lost=0

This means that you sent 4 pings to your router, and received 4 pings back, indicating good connection. Sometimes you may receive 1 - 3 pings, which is OK.
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#3 CaveDweller2

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Posted 21 February 2010 - 01:18 PM

Have a look in Device manager(hold down the Windows key and type the pause/break button, Hardware tab, Device manager button) - click the + beside Network Adapters, right click the card, click Properties, click Power Management tab. Take the check out of anything on that page, click OK, close device manager and click OK again. See if that solves the issue.

Hope this helps thumbup.gif

Associate in Applied Science - Network Systems Management - Trident Technical College


#4 Finsteigle

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Posted 24 February 2010 - 02:48 PM

OK - thanks for your replies

This has been mysteriously ok for a couple of days but just occurred while I was using the PC. Rare to catch it actually happening.

Cavedweller2 - Thanks for your suggestion, I had already unselected the power saving options so this doesn't seem related.

Desion - I have done as you asked with the following result: -

Pinging 192.168.1.1 with 32 bytes of data:

Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

Looks ok doesn't it?

What do you suggest next please?

#5 drunkducki

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Posted 26 February 2010 - 07:33 PM

what do you mean when you say you cant reach the router at 192.168.1.1?
if you can ping that ip address that means you can reach the router.

#6 Finsteigle

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Posted 27 February 2010 - 02:24 AM

When this problem is happening I can't access the router admin acreen (using IE8)
I can't browse the Internet or get my email
Other PCs on the network can do all the above which suggests to me this is something on my PC, or between my PC and the router.

It pings ok but unless I revert to using morse code that isn't going to be of much use I'm afraid!

#7 drunkducki

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Posted 02 March 2010 - 11:46 AM

try using a different pci slot and a different network cable

#8 drunkducki

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Posted 02 March 2010 - 11:52 AM

what's the message on IE when you cant connect?
Have you try using a different web browser?

#9 CaveDweller2

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Posted 02 March 2010 - 12:28 PM

Do you have a XP CD?

If you do put it in the PC, close anything that opens, open a command prompt and type sfc /scannow and hit Enter. This will scan your PC for corrupt or missing files. Sounds to me like there is something wrong with the OS since you used another NIC and got the same result.

Hope this helps thumbup.gif

Associate in Applied Science - Network Systems Management - Trident Technical College





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