Can't access WIFI from desktop PC (Wired connection)

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billywill91

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I have a TP-Link router. Was working fine until one day out of nowhere couldn't access internet from desktop pc (with ethernet cable) or from androids but was working properly on my laptop. Turns out my LAN port on the motherboard of my PC was fried so I got a new PCI network card. When I connect the ISP provided broadband cable directly into the PC, internet is working but when I connect that cable to the router and then connect the router to my PC with another cable, the yellow exclamation mark appears, and it won't let me access the router's default page(192.168.0.1) even. All the drivers are installed for it, in the adapter settings the option for "obtain IP address automatically is set". In my router's settings page, I can see under the DHCP client list that it can detect my PC's mac connected to it along with the lease time.

Just to be sure I even tried to use my laptop's ethernet port to see if the problem lies with my PC. The exact same thing happens with my laptop's wired connection as well. I have reset the router a number of times, and tried to set it with my PC, it will let it access the home page of the router just once, and when I enter the username password, it starts loading and finally request timed out error comes up. It' s probably not a virus because i just reinstalled windows (7 ultimate -x64) on a completely formatted hard disk. All is working fine however with the wireless part of the router. I can access internet from my Laptop and my android phones wirelessly but the wires are what is leaving me hanging.

Also the microsoft troubleshooter keeps giving me the error default gateway is not available. The default gateway in this case the router's ip address can be accessed from my laptop with W-LAN but not from my desktop PC's or the laptop's wired connection ?

Please tell me if there is anything I can do to fix this issue. I will try to answer all of your questions that I possibly can. Thanks.
 
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LouBraun

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Since both your PC and laptop computers will not properly connect to your router, but do work OK when hooked up to your broadband modem, it looks as if the router failed. It is also possible that your PC's Ethernet port failure and router failure had the same basic cause.

Trying a new (or borrowed) router is the next step. Hopefully the replacement router fixes the problem. Recommend plugging the router into a decent UPS or surge protector.
 
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Ralston18

Ralston18

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Regarding: "When I connect the ISP provided broadband cable directly into the PC, internet is working but when I connect that cable to the router and then connect the router to my PC with another cable..."

What model TP-Link router?

Wondering about your wired connections - should be something such as the following line diagram:

ISP ------->Modem---Ethernet cable --->[WAN]Router[LAN] ---Ethernet cable ----->[LAN/PCI network adapter]PC.

What make and model is the ISP provided Modem (or perhaps Modem/Router)?

What WAN and LAN ports are you using? Especially between the modem and router?

Verify the connections being made.

Reference:

http://www.tp-link.com/us/faq-618.html

 
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billywill91

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@Ralston18

"What model TP-Link router?"

It's a TL -WR740N

"Wondering about your wired connections - should be something such as the following line diagram:
ISP ------->Modem---Ethernet cable --->[WAN]Router[LAN] ---Ethernet cable ----->[LAN/PCI network adapter]PC"

I don't have a modem.. atleast not sure if I have one or not. The ISP gave me a cable which comes through my window and goes straight into the desktop LAN port, so the diagram should be like -

ISP ethernet cable -----> Router -----> PCI LAN card in PC.

"What make and model is the ISP provided Modem (or perhaps Modem/Router)?"

Like I said there is no such device like a modem or anything provided so sorry can't answer properly.

"What WAN and LAN ports are you using? Especially between the modem and router?"

How do I find out what ports my WAN and LAN are ? I have absolutely no idea. All I can tell is that all of them are static IP.

"Verify the connections being made."

I did verify them. There does not seem a problem with the connections or cables. It is as if the output LAN ports of the router is unable to communicate at all with any device connected to it.

 
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billywill91

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@LouBraun

I am starting to think that my router has failed too. But it is just that it is carrying out its wireless activities perfectly. So I just want to be sure that it is indeed the router which has failed and not something that I am unable to do to make it work. If the router fails shouldn't it fail completely instead of working partly ?
 
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Ralston18

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Does the following link provide the User Guide for your router?

http://setuprouter.com/router/tp-link/tl-wr740n/manual-737.pdf

Strictly a router.

The router's ports are labeled WAN (one port) and 1,2,3,4 for the LAN ports. Wired end user devices are connected to the LAN ports.

Reference the User Guide: Pages 4 and 5.

Which port is the ISP cable plugged into?

Did the ISP tech actually run a cable in through an open window? What is on the other end of that ISP provided cable and where is that device?

How do you know that the LAN ports are static: i.e., static IP addresses? Someone had to set that up within the router. And doing so must be done correctly.

Also, if you have been switching between wired and wireless on the wired PC be sure that you have enabled the desired wired or wireless adapter and that all other network adapters (wired or wireless) are disabled.

Easy to overlook if the motherboard has, for example, a built in wired adapter and then you install a PCI wired adapter. Only one network adapter and that adapter must be correctly configured to go to the network's router to request and receive an IP address. Be that address dynamic (DHCP) or static.

Refer to the User Guide to check both the physical connections and network configuration settings.


 
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Saga Lout

Saga Lout

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Billywill91, will you please clarify the status of your contract for an Internet service. Do you pay a company for that service or are you poaching bandwidth from a third party with or without their knowledge?

I would be grateful to other posters not to put any more advice on here until that is clarified.
 
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billywill91

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Sorry for the late reply. I haven't visited this website in a long time. To answer your question, yes I pay a broadband company for the internet connection. I'm not sure what exactly you are trying to insinuate here. If I had the knowledge of how to direct internet service from a third party without their knowledge I wouldn't be asking this question in a forum like this in the first place.
 
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billywill91

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Does the following link provide the User Guide for your router?

I think so.

Which port is the ISP cable plugged into?

In the WAN port. It's the port which is color coded in a different color from the other LAN ports.

Did the ISP tech actually run a cable in through an open window? What is on the other end of that ISP provided cable and where is that device?

Yes the ISP wire was provided by the guy who set up the internet connection. He gave me the IP, DNS subnet and gateway addresses. I do not know what is on the other end of the cable. The cable runs into another bunch of cables outside my building where they are routed together to I don't know where. The "device" is probably in the ISP office.

How do you know that the LAN ports are static: i.e., static IP addresses? Someone had to set that up within the router. And doing so must be done correctly.

I selected static IP when setting up the router. That was a long time ago. It worked fine for two years after that. So I think it was done correctly. It recently started showing problems. And it is still doing it's wireless functions perfectly. If there was a problem with setting up the router shouldn't it broadcast nothing at all ?

Also, if you have been switching between wired and wireless on the wired PC be sure that you have enabled the desired wired or wireless adapter and that all other network adapters (wired or wireless) are disabled.

My pc has no wireless adapter. Neither have I been switching b/w wired n wireless. I have been connecting the ISP provided cable to the PC to get internet and then connecting it back to the router when not needed.

Easy to overlook if the motherboard has, for example, a built in wired adapter and then you install a PCI wired adapter. Only one network adapter and that adapter must be correctly configured to go to the network's router to request and receive an IP address. Be that address dynamic (DHCP) or static.

I only installed a PCI adapter because my integrated LAN card stopped working completely. So I can connect to the internet without the router.Therefore I think the PCI card is fine. It's just whenever the router is used, it shows no internet and is unable to even open the router's login page.
 
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Saga Lout

Saga Lout

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This incarnation of a necro thread over a year old, is being closed.

If you have the same problem and have lived with it for a year, it canot be a serious issue.

My comment was valid and had no insinuation but merely to ask if you had a legitimate account with a Service Provider. Not having one would explain what is happening.

I have exchanged Private Messages with Ralston18 who also doesn't think this can be picked up and carried on.

Start a new thread if you wish and a fresh batch of responders may be able to help but many will say "buy a new motherboard."
 
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