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Power-User

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Router Won't Talk to Laptop

09/26/2008 11:12 AM

I wasn't quite sure where to post this, but believe the problem is software related.

My problem is my laptop, connected via ethrnet, does not talk to my router. Everything was working fine, but then I lost my connection, and have not been able to re-establish it. I often take my laptop with me, and plug / unplug the cable as necessary, but now I can't connect. I get an error staing "Limited or no connectivity"

Both the laptop and router are set-up for automatic DHCP, but the laptop does not accept the IP the router tries to assign it. None of these parameters were changed, though I've tried changing them since in an effort to get the bloody thing to connect.

I have a HP Compaq nc6120 (running XP Pro)with a Broadcom NetXetreme Gigabit Ethernet card and the router is a Linksys WRT45G2. The router does not have internet access; I use a cell modem card for that. We also have one other laptop and a network printer on our small system, but they work fine. If I move my laptop to the other know working connection, I get no results, so I suspect the problem lies with my laptop or the software in it.

I have attempted to reset the router and the laptop several times, but it does no good. Using ipconfig, I see that my machine is not establishing the proper IP addresses to work. The linksys IP address is 198.162.1.1, the default for the unit, and the assigned address should be 198.162.1.100 or higher. From ipconfig;

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\user>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : snbcfasgfnv
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : Yes
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
Physical Address. . . . . . . . . : 00-14-38-0E-0A-40
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IP Address. . . : 169.254.24.45
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 169.254.24.45
PPP adapter Sprint Mobile Broadband - Pantech:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
Physical Address. . . . . . . . . : 00-53-45-00-00-00
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 70.6.63.19
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 70.6.63.19
DNS Servers . . . . . . . . . . . : 68.28.58.92
68.28.50.91
NetBIOS over Tcpip. . . . . . . . : Disabled
C:\Documents and Settings\user>

I've tried reseting windows IP and winsock, but it yeilded no results. From the other laptop, I've gone into the linksys router. It has a window which reports active IPs t for the router. I can see that an address was issued for my computer name (with MAC address), yet my laptop does not use it. I found an article in MS describing registery enteries for TCP/IP, and have even gone as far as to modify the registry to put known working IP addresses, submasks, etc., but still could not get it to talk again. I tried pinging from the laptop, and could not do so - it times out. If I use the working laptop, I can ping the printer and router.

I've updated the driver for the Broadcom card. No good.

At this point, I've tried everything I can think of, and I want to curse, drink, or both.

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Guru
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#1

Re: Router not talking to Laptop

09/26/2008 12:03 PM

I'm using similar laptop only nx9420, which stuffed the same ethernet card and WinXP PRO. I've installed there Linux next to Windows and my network connection worked fine for both linux and Windows.

1.Check your ethernet socket. Isn't it worn after multiple plugs-unplugs?

2. If you have saved backup of your system, return your system back to date when all worked fine.

3.Make test ethernet connection using cross cable to another PC.

4.Uncheck autoconfiguration mode for network and write down all IPs for laptop, Gateways by your hands.

5.Get a linux live-CD (Knoppix) and try out it for network connection. If it works, yes it's problem with Windows OS, if doesn't --- you have a problem with your iron.

6.Who knows, maybe drink is not a bad idea at all.

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Power-User

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#2
In reply to #1

Re: Router not talking to Laptop

09/26/2008 1:54 PM

Thanks for your reply. Let me reply to your numbered points -

  1. The socket appears to be ok. I can see from the lights on both the router and laptop that some kind of communication is taking place.
  2. Unfortunately, I do not have a recent back-up to go to. I have tried to reset Windows IP and Winsock to their original states, but to no avail.
  3. An adhoc connection. Considering the trouble I'm having just trying to establish a normal connection, this may be more trouble than it's worth. None the less, I'll try it once a PC becomes available again.
  4. I have tried a manual approach. With my PC, I can set the IP to a desired address, and have attempted to do so with a known address from the router. The problem is that even though the router can have its "Auto" mode disabled, I did not see a way to manually address with the exception of internet access. I tried using the internet access table, but it did not work.
  5. I'll have to explore the linux idea. I'll on-line search to see what I can find.
  6. Yes, I agree. It has to be beer thirty somewhere on this planet.

Its troubling. I can access the router from another laptop and see my machine with the computer name and mac address - so something is talking. I can also see the IP that has been assigned to my connection. However, my laptop does not accept or set up the adaptor with that assigned IP address, it does not even get close. When I attempt to "repair connection" from the network coonection window, it errors out stating it was unable to renew the IP address. I get the same error when I use IP config. If I manually set my laptop to the assigned IP address, (with submask, etc.) it connects, but the connection is useless - I can't even ping over it. I'm fairly certain the problem is with the laptop software somehow, I just can fix it and it's piss'n me off.

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Guru
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#3
In reply to #2

Re: Router not talking to Laptop

09/26/2008 2:47 PM

Just for check p.5 http://www.knoppix.org/ (you can download knoppix image cd here) www.pctech101.com - great shop where I used to buy linux toys.

A friend of mine had similar problem with damn TP-LINK adsl modem. He cursed loudly the day when he decided to upgrade WinXP. Once he's got upgraded XP modem ignored his PC completely. He could sort problem out only after full OS reinstalling.

By the way, are you logged in as a simple user. I'm supposing you have there an administrative privilegies. You would try to sort your problems out being downloaded under protect mode.

It's too late here, I stopped my work and go to bed.

Hope all will be well,

Good luck, caramba

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Power-User

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#4
In reply to #3

Re: Router not talking to Laptop

09/26/2008 5:55 PM

I checked out the knoppix site. I am not familiar with Linux, and it looks a bit out of my league. Besides, I don't have a huge amount of bandwidth. It would take some time to download the image. Maybe I'll attempt this if all else fails.

Yes, I do have administrative privileges in this machine.

Thanks again.

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#5

Re: Router Won't Talk to Laptop

09/26/2008 8:49 PM

No help from me I'm afraid, due to total ignorance. However, if there were an award for a "Good Question" I would vote for this one for sure.

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Guru
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#6

Re: Router Won't Talk to Laptop

09/27/2008 12:03 AM

Have you tried plugging your laptop into another router? That in itself would give you valuable data. You've already established that the problem is not with the router, in that your other laptop and network printer do connect to it. What about wireless? According to the HP/Compaq site, your machine is WiFi capable. Have you tried to connect it via that interface? Just off the top of my head and not having your hardware in front of me, I see three possibilities.

One, your OS has become corrupted within the TCP/IP protocol stack, in which case you will in all probability have to reload Windows.

Two, your network interface card has gone the way of all flesh and must be replaced.

Three, there is a problem with your RJ-45 socket (as has already been suggested) and it needs to be replaced, providing it is not an integrated component on the motherboard.

Before you do anything else, do try connecting your laptop to another router. If it connects via cable, then frankly, considering the fact that you've already examined your network settings, I would contact HP support for some help. Or I might well replace the router, preferably with a WiFi unit.

If it connects via WiFi but not via cable, then the problem is likely with the NIC or plug. Though there is also the unhappy possibility that it could be the motherboard, if the plug is on the board itself. You might try opening the case to access the card and removing it, blowing out the connections, and re-seating it. This sometimes does solve this type of problem, though that is no guarantee.

Assuming that you can connect via WiFi but not via cable, the next thing you might try is to see if replacing the card and/or plug solves the problem, again assuming the plug can be replaced.

If you cannot connect to another router, either via WiFi or cable, back up all your data to external media and try reloading windows. If that fails to solve the problem, then the problem is almost certainly hardware.

Now, if it is your hardware, particularly if it's a motherboard-mounted plug, there is one way you can restore your connection, by using a PCM-CIA network interface card. I have used this dodge before to extend the life of an otherwise serviceable machine, but it is questionable how much longer the machine will live in this case, since once the board begins to fail, total failure is inevitable, though when is an open question. Your best bet in this case is simply to get a new machine and load your backed-up data to it. Besides, the new machines are vastly more powerful than even a machine such as yours, which is (according to the information I've gotten off the website) perhaps two years old?

Troubleshooting this type of problem can indeed be a frustrating experience.

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Anonymous Poster
#7
In reply to #6

Re: Router Won't Talk to Laptop

09/27/2008 12:42 AM

Hi there,

don't know too much about, but

"IP Address. . . . . . . . . . . . : 70.6.63.19
Subnet Mask . . . . . . . . . . . : 255.255.255.255" is strange. Why don't you try 255.255.0.0 ?

Hope that might help,

Omega

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#12
In reply to #7

Re: Router Won't Talk to Laptop

09/27/2008 6:04 AM

It's his Internet connection through dial-up modem either GPRS cell phone. These parametres were assigned by ISP.

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Guru

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#8

Re: Router Won't Talk to Laptop

09/27/2008 3:18 AM

There is a update for the Broadcom card that causes me trouble if it gets downloaded from Microsoft. I have to uninstall the new update and reinstall my orginal driver for mine to work.

Just incase you tried to update yours.

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Guru
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#9
In reply to #8

Re: Router Won't Talk to Laptop

09/27/2008 3:25 AM

Brilliant. I wish I had thought of it. *Sigh* Go into your system management and select properties of the card in question. Under the Driver tab, select "Roll Back Driver". It just might work.

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#10
In reply to #9

Re: Router Won't Talk to Laptop

09/27/2008 3:30 AM

I didn't think of it till after I had to reinstall the drivers twice. Then I realized that AUTO UPDATE was where the problem came from and set it to manuel and custom install so I can see what it wants to install and prevent the update.

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#11
In reply to #10

Re: Router Won't Talk to Laptop

09/27/2008 3:36 AM

That explains it. I never use Auto Update except in notification mode. And I always use the custom install so as to be able to decide what I want to install. Brilliant sir, brilliant.

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#13

Re: Router Won't Talk to Laptop

09/27/2008 12:12 PM

If you're not beer [or not too beer], here's my next attempt to shoot your trouble.

Yes, your ipconfig/all response [169.253.x.x/255.255.0.24] means that there were not assigned properly gateway in no way. So try out these steps as follows:

1. I would suggest refuse of autoconfiguration mode and type in 198.162.1.10x as laptop IP address in TCP/IP dialog window(instead x you can use 2,3.. any address which not coincides with other nodes at network).

2.Type in 192.168.1.1 as assigned default gateway at the same dialog window below.

3.In console/shell type in ping 127.0.0.1 to check whether IP driver is working smoothly. Hopefully all will be well unless your driver is wrong.

4. Type in ping 198.162.1.10x (yours assigned IP for laptop). If a route table has not any mistakes it will affect to the same result as at step 3. [Have you used your node DNS name instead IP address?]

5. Type in ping 198.162.1.1 [addreess of your router]. You should get IP packets exchanging.

6. Type in ping 198.162.1.10y (where y is assigned as remote PC at your network). You should get IP packets exchange.

7. If you have no succeeded in steps 5,6, tight politic of secure protocol IPSec could be a plausible reason. You can type in ping command with parametre -w zz. where zz is a time out in seconds (it should be more than 4 assigned as default). You can shut IPSec down or change its politics asking of that your network administrator. You can try out to recover your network connection being under protected mode as admin (hit F8 when reload your system and chose a protection mode with network and comman line). In any case you can shut down IPSec on your laptop through control panel->Administration->local services menu.

8. In TCP/IP dialog window push option button for checking out whether Filtering flag has been unchecked. If not, uncheck it and try again.

9. Try out command arp -a(arp -g). It does clear cache for Address Resolution protocol. If you wish to remove any data of certain IP address type in command
arp -d IP-address.[you can apply this step independently to any step]

10. Check out your network routing by means of commands pathping 198.162.1.1 or pathping 198.162.100.y. This command makes estimation of lost IP packets in attempt to achieve destiantion node address applying overjumps. You can evaluate where you were getting stuck.

11. Try out command route print. You'll be given a routing table which you can analyse: are there useless routing loops or so.

12. Use command tracert IP-address. It's like pathping, but it makes echo response and attemption to achieve destination node up to 30 jumps. it can be useful to find out the reason of routing trouble.

It's compillation of forums' entries in dotRu domain sites which I done and translated in hope it'll help you. If it won't, I suppose you can find experienced person nearby.

I've been using similar commands for linux network's tuning.

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Power-User

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#15
In reply to #13

Re: Router Won't Talk to Laptop

09/29/2008 11:32 AM

This is some good info. I will keep this for future reference if this problem occurs again.

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Power-User

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#14

Re: Router Won't Talk to Laptop

09/29/2008 11:24 AM

To All,

Thank you for your insightful replies. After all the trouble this has put me through, it is now working. Yes, that's correct, it's now working. And I could not tell you why. I left my laptop unplugged from the network for the weekend, and it resumed functioning when I tried it again this morning. My guess is that it has something to do with the lease it receives from the router. I think it had some kind of problem lease that expired over the weekend allowing it to reconnect today. I still think the problem is with the laptop as I did a reset on the router, unless the reset does not flush the router.

I'm just thankful that the *&^* thing works again.

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