No internet (or IP) when using LAN connection

[gregor]

Hi.

 

Yesterday, something happened. I don't know what or where to problem lies. As an IT person, I know how stuff should work so please help me out finding the problem:

 

1. Yesterday evening, the roter (with which my PC is connected over LAN) crashed. Other devices such as phone, tv and printer are connected over wifi. 

2. I've rebooted router and all of the sudden, in the same time, windows (10) nagged that it has update ready for me so I've did it.

3. After I was back, I noticed I didn't get a valid ip address back from router. Actually, I didn't get anything back. Checking other devices, I saw everything was working over wifi. I even checked if my NAS, connected to router over LAN was working. It was.

4. So I kinda scaled the problem from possible router failure to computer problem. 

5. ipconfig /release, /renew or /flushdns didn't bring anything

6. So I've checked my motherboards downloads page (http://www.asrock.com/mb/Intel/H97M%20Pro4/) and installed latest drivers. Didn't helped. I went on intel's site and download the drivers from there too. No go.

7. I've checked the connection with 2 different cables. No go.

8. I've connected computer in different LAN ports on router, same story. 

9. I've messed with netsh commands with ip reset and what not, and that didn't bring much to it either. 

10. I've noticed alot of people were having problems if they've had Cisco VPN client installed in previous version of windows so I've searched the registry and cleaned everything I could find (I didn't found anything)

11. I've also removed Avast! because Internet said it would help. It didn't.

12. I went in safe mode with network and I hadn't had any success there either.

13. I've checked processes, services, used hijackthis and many other app to see if there's something fishy going on. Nada.

14. It took me few hours, without result. Thank god I found some old Wifi dongle which I'm using right now. 

15. And then I've decided... reset everything. Remove everything. Start from scratch. 

16. And guess what... Ethernet doesn't work.

 

Now, can someone please help me out with this thing because its driving me crazy and I'm about to throw my computer out of the window and never buy it again (which of course won't happen), but I really really want to find out, where the problem is. I'm also willing to pay (paypal) if someone could help me out using Teamviewer (if of course, we/you find a solution).

 

Thank you all for participating and regards.

[BinaryData]

Couple things...

 

1. Did you check drivers? - Attempted this already.

2. Does the Network Adapter show up in your Hardware List?

3. Do you get any lights on the Network Adapter?

4. ipconfig /all doesn't show anything?

5. Is the Network Adapter enabled?

6. Check the settings in the actual adapter itself, make sure they are set for DHCP and not static.

 

Check the router's Client List as well, to see if it even recognizes it. Cisco VPN shouldn't have any effect at all, unless it's turned on.

[GotBored]

What kind of security is on the router, Have you only enabled access to certain MAC addresses?

 

I've noticed on some rare occurrences during a hard reset or other tinkering (possibly during OS upgrade) I've had network card MAC addresses reset and change to something else. If you blocked all other physical addresses except the ones on an allow list that were on your network it makes sense that all the other systems connect and the PC that was upgraded doesn't because it changed it's MAC address.

 

Some other quick checks.

 

- check to make sure you have DHCP enabled, you might have previously set a static ip address that may have been taken by another device with DHCP enabled on the network if it connected before the PC.

- Do you have a free Ethernet port on your computer? If so try connect there.

[BinaryData]

  On 05/12/2015 at 11:26, GotBored said:

What kind of security is on the router, Have you only enabled access to certain MAC addresses?

 

I've noticed on some rare occurrences during a hard reset or other tinkering (possibly during OS upgrade) I've had network card MAC addresses reset and change to something else. If you blocked all other physical addresses except the ones on an allow list that were on your network it makes sense that all the other systems connect and the PC that was upgraded doesn't because it changed it's MAC address.

 

Some other quick checks.

 

- check to make sure you have DHCP enabled, you might have previously set a static ip address that may have been taken by another device with DHCP enabled on the network if it connected before the PC.

- Do you have a free Ethernet port on your computer? If so try connect there.

Expand  

Hmm..

 

Another question is;

 

1. can you access your routers internal page from said desktop while connected on the cat5e/cat6 connection?

[gregor]

Hi @BinaryData and thank you for your swift reply.

 

1. True

2. It does, Device manager shows me me my Intel Ethernet Connection I218-V

 

 

3. The lights are... as you would suspect. The green when connection is made and orange, when no conn configured (orange above, yellow bottom)

 

4. Here's the ipconfig /all output for my Ethernet adapter

Ethernet adapter Ethernet:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
   Physical Address. . . . . . . . . : D0-50-99-27-E4-50
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::2c09:7b08:a969:87db%2(Preferred)
   Autoconfiguration IPv4 Address. . : 169.254.135.219(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.0.0
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 47206553
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1D-F4-6F-55-D0-50-99-27-E4-50
   DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                       fec0:0:0:ffff::2%1
                                       fec0:0:0:ffff::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled

 

5. adapter is enabled (visible from device manager screenshot above and in network adapters).

6. Properties for tcpip/v4 and tcpip/v6 are both set to dhcp without anything else being in.

 

UPDATE

 

Trying to "Diagnose" my adapter from adapters list, I get next error (I'd love to post you a screenshot but I'm getting allowed 2MB here on neowin forums). 

 

Here's the image from tinypic: 

 

Of course, trying to use the "fix as administrator" doesn't fix anything and I'm in a dead zone.

 

Now, to update the post and answer @GotBored answers:

 

1. There were no macfilters set on router. None. 

2. Sadly no, this is the only ethernet port.

 

 

UPDATE 2

 

  Quote

1. can you access your routers internal page from said desktop while connected on the cat5e/cat6 connection?

Expand  

Of course not. When on LAN, as I don't get any IP, I cannot. When connecting with Wifi, I can access it without a problem.

 

 

 

 

[BinaryData]

  On 05/12/2015 at 11:29, gregor said:

Hi @BinaryData and thank you for your swift reply.

 

1. True

2. It does, Device manager shows me me my Intel Ethernet Connection I218-V

 

 

3. The lights are... as you would suspect. The green when connection is made and orange, when no conn configured (orange above, yellow bottom)

 

4. Here's the ipconfig /all output for my Ethernet adapter

Ethernet adapter Ethernet:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
   Physical Address. . . . . . . . . : D0-50-99-27-E4-50
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::2c09:7b08:a969:87db%2(Preferred)
   Autoconfiguration IPv4 Address. . : 169.254.135.219(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.0.0
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 47206553
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1D-F4-6F-55-D0-50-99-27-E4-50
   DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                       fec0:0:0:ffff::2%1
                                       fec0:0:0:ffff::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled

 

5. adapter is enabled (visible from device manager screenshot above and in network adapters).

6. Properties for tcpip/v4 and tcpip/v6 are both set to dhcp without anything else being in.

 

UPDATE

 

Trying to "Diagnose" my adapter from adapters list, I get next error (I'd love to post you a screenshot but I'm getting allowed 2MB here on neowin forums). 

 

Here's the image from tinypic: 

 

Of course, trying to use the "fix as administrator" doesn't fix anything and I'm in a dead zone.

 

Now, to update the post and answer @GotBored answers:

 

1. There were no macfilters set on router. None. 

2. Sadly no, this is the only ethernet port.

 

 

 

 

 

 

 

Expand  

Ok, that IP that's being given out, the 169.x.x.x that's an IP that's thrown out when DHCP fails and an IP Address isn't given out. Has to do with the Release/Renew.

 

Check your DHCP configuration on the router.

Then power down your router.

Wait 5 - 10 minutes

Boot it back up.

 

 

To clarify something, you've connected the PC with the problem to 1 of the other ports on your router, correct? And still, no connectivity? My colleagues and I discussed this for a couple minutes. What sounds like, is your NIC on your Motherboard may have died. There is a small chance that this has happened, check to see if your board is under warranty.

[i11usive]

Also try running the following command from an elevated command prompt and reboot:

 

netsh winsock reset

[GotBored]

Is your PC connected directly to router or does it pass via a Powerline adapter or anything like that?

 

Try BinaryData's suggestion, after router reboots also reboot PC.

 

If connection isn't made turn off dhcp on your PC and set a static IP address that's in your local network range. Check if connection is made to router.

[gregor]

Thank you again for replying. 

 

DHCP on router's side is okay. As said, My NAS is also connected over LAN with router and status page from router is showing that it got a new dhcp request and send a new ip to NAS. Now, Answering your clarification- Exactly. I've tried all 4 router ports. I've thought at first that maybe the router port went bananas, then I've tried to connect my PC to the port on which, my NAS is working without a problem. Sadly, its the same.

 

It is possible my NIC on mobo could died but then, if it would die, how can the device manager find it, how can i install drivers for it etc? ://

 

UPDATE

 

@i11usive running command which resets catalogs and rebooting the computer afterwards didn't helped

 

@GotBored my pc was connected throug powerline adapters. But, when I've started to find for problems, I've connected my computer directly to router (after which I've also tried 3 different cables). As we speak (in the process of debugging), my PC is connected to router directly, no adapters in between.

[+BudMan MVC]

Well for starters, does it work if you give it a static??  Just because you can not get an IP address from dhcp doesn't mean that nic is bad.. I wold setup a static IP and see if that works.  If that works then we can troubleshoot your dhcp issue and why machine is giving you APIPA address..

[BinaryData]

  On 05/12/2015 at 11:50, gregor said:

Thank you again for replying. 

 

DHCP on router's side is okay. As said, My NAS is also connected over LAN with router and status page from router is showing that it got a new dhcp request and send a new ip to NAS. Now, Answering your clarification- Exactly. I've tried all 4 router ports. I've thought at first that maybe the router port went bananas, then I've tried to connect my PC to the port on which, my NAS is working without a problem. Sadly, its the same.

 

It is possible my NIC onn mobo could died but then, if it would die, how can the device manager find it, how can i install drivers for it etc? ://

Expand  

A failed hd still shows up in the Device Manager, however it is unusable. I said it could be a small possibility.

 

Try illusive's command. My brain is stuck on enterprise level problems. Through process of elimination, we can narrow the culprit down.

 

And BudMan to the rescue! I couldn't remember the terminology for the Address he got.

 

Just a thought, @gregor can you set a "preferred" connection based off the MAC Address?

[DaveLegg Developer]

Moved to Internet, Network & Security

[gregor]

@BudMan

 

Setting my adapter to static IP didn't help.

Ethernet adapter Ethernet:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
   Physical Address. . . . . . . . . : D0-50-99-27-E4-50
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::2c09:7b08:a969:87db%5(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.0.19(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.1
   DHCPv6 IAID . . . . . . . . . . . : 47206553
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1D-F4-6F-55-D0-50-99-27-E4-50
   DNS Servers . . . . . . . . . . . : 192.168.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

 

@JaLooNz

 

my adapter doesn't show as unplugged or connected but as "Unidentified network".

 

 

@BinaryData

 

I am going to try to set preferred network in router settings as you said:

 

 

...aaand that didn't helped either.

 

[BinaryData]

How is your connection coming in?

Modem -> Router -> WiFi/LAN Connections?

I'm wondering if you took the router of the mix, and plugged it in, what would happen.

 

Also, whats the Brand/Model of your router? That may help us.

[DaveLegg Developer]

  On 05/12/2015 at 12:13, gregor said:

@BudMan

 

Setting my adapter to static IP didn't help.

 

 

@JaLooNz

 

my adapter doesn't show as unplugged or connected but as "Unidentified network".

 

 

 

@BinaryData

 

I am going to try to set preferred network in router settings as you said:

 

 

 

...aaand that didn't helped either.

 

Expand  

When you set a static IP, it may show 'Unidentified Network', but could you ping the router?

[xendrome]

Sounds like you've got a bad NIC card on the board.

[T3X4S]

Try to think back to when it all started....

A windows update of some kind after you rebooted your router.

(just for s**ts & giggles - use 8.8.8.8 for your primary DNS, and 8.8.4.4 as your secondary DNS - google's public DNS))

Since your wireless devices are all getting connectivity, then the problem is your computer, or the connection to your computer.
You have swapped cables, changed ports, flushed DNS, all the usual suspects - 

Can you System Restore your computer ?
 

 

[gregor]

@BinaryData

 

Modem/Router (single device). No switch, no powerline adapter, no extra router. The device is my ISP's device called "Connect Box" (pdf here: https://www.unitymedia.de/content/dam/unitymedia-de/assets-de/pdf/Handbuch-Connect-Box-Ver.0.9.pdf)

[BinaryData]

  On 05/12/2015 at 12:21, gregor said:

@BinaryData

 

Modem/Router (single device). No switch, no powerline adapter, no extra router. The device is my ISP's device called "Connect Box" (pdf here: https://www.unitymedia.de/content/dam/unitymedia-de/assets-de/pdf/Handbuch-Connect-Box-Ver.0.9.pdf)

Expand  

My German blows, haha. From everything you've tried, it looks like it may end up being your desktop card.

 

Do you have a spare NIC card you could try, that isn't WiFi?

[GotBored]

With the static address still set can you login into router?

 

I'm assuming its on 192.168.0.1, just enter it in a browser.

[+BudMan MVC]

so when you set a static, and you tried to ping your router..  That doesn't work??  right after you ping look in your arp table.. Do you see the mac of the router??  Do you not see an entry in the arp table.. Do you see invalid mac, or other error in the arp table??

 

you can view the arp table with arp -a from cmd prompt

 

please after setting static, show ipconfig /all then ping ip of your router and then arp -a and post the results.

 

 

[cork1958]

Yep,

Sounds like a bad NIC to me also seeing as how you've already tried new cables and different ports on router. Would've tried that before going through all the changes you have so far.

[gregor]

Everyone... progress... and consider it resolved. But before I tell you what the cause was, here's how everything started again and what I learned or how did I shrink the devices that could be the cause out of everything:

 

- My router/modem was in a drawer which, of course when connection went down, I've found out to be too warm. Meaning this could be a possible cause for malfunction and hang. Reboot, place it outside the drawer.

- Exactly then, I also noticed Windows Updates were ready and that took at least 30 minutes to complete.

- No more internets, which was actually the problem BEFORE I started Windows Update.

- Phone (wifi), NAS (lan), TV (wifi) reconnected without a problem after Modem was back up and running.

- Tried all possible things, updating drivers, setting to static, removed drivers, safe mode, netsh commands, pinging. Nothing helped.

- Changed connection from PowerLine adapters to direct connection to modem. Changed 3 different cables. 2 of them came with PowerLine adapters, 1 was extra that was unused and bought separately.

- I didn't had any Linux Bootable USB sticks to test if this was a driver issue. But, my bios can auto-update itself and could show up DHCP or anything similar from NIC on motherboard. It didn't got any IP either. So.. was this the Windows issue? Doesn't look like, right?

- Check again if are cables are connected, check different ports, reboot complete network (factory reset modem, shutdown, etc).

- Nada

- So I went and start looking in my gadgets and cables box if I have any other spare cable... could this be the cat5, cat5e issue? 

- Found a cat5e. Plugged it in. And boom... in a second, I got an assigned ip. 

- So once again... old cables which previously worked, stopped working suddenly?

- So I've plugged the old cable back in and... it worked too.

- Tried all other cables which I've tested through the past two days. All worked.

- So the solution was...

 

1. Find cat5e cable. Get connection

2. Plug back the old cat5 cable. Got connection.

 

 

So I'll ask myself and you all that participated in this topic a question... What the actual F**k???

[Anibal P]

Throw out the old cable, to be safe 

I know resolved, but was thinking the port in the router could be acting up

[+BudMan MVC]

difference between cat 5 and 5e as you issue??  NO..

 

Could be the cable has loose, and it being moved around caused a problem.. So you using new cable and then back to old cable could of moved the wire around in side.  Could of be bad connection at the plug side of either your pc or your router.

 

Simple troubleshooting of layer 2 here..  Just because your pc shows that there is connection on the interface...  When you set static and it didn't work you should of tested for did you see the mac or not via arp..