Question Connecting Ethernet cables causes dsl and internet lights on my modem to go off

Jul 23, 2020
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Hi. Here is my strange problem: After reinstalling windows 7 on my old pc, I cannot use my Ethernet cable to connect to internet. I have a dlink dsl2730u modem. When I connect the Ethernet cable to my pc, suddenly the internet and dsl lights on my modem turn off. As soon as I disconnect the Ethernet cable, the dsl light starts blinking again. I was able to connect to internet using Ethernet cable before I reinstalled windows 7. I used the very same cable and connected my laptop to my modem and there was no problem. (so, I concluded that the cable is fine) Also, I downloaded and installed the driver for my network adapter from Realtek website. But still there was no progress. Can anyone help me with this issue please? P. S: sorry for my bad English.
 
Jul 23, 2020
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Here you are:

Code:
Windows IP Configuration      Host Name . . . . . . . . . . . . : My-PC     Primary Dns Suffix  . . . . . . . :     Node Type . . . . . . . . . . . . : Hybrid     IP Routing Enabled. . . . . . . . : No     WINS Proxy Enabled. . . . . . . . : No     DNS Suffix Search List. . . . . . : domain.name 
Ethernet adapter Local Area Connection:      Connection-specific DNS Suffix  . : domain.name     Description . . . . . . . . . . . : Realtek PCIe GbE Family Controller     Physical Address. . . . . . . . . : 00-21-85-6B-B8-8D     DHCP Enabled. . . . . . . . . . . : Yes     Autoconfiguration Enabled . . . . : Yes     Link-local IPv6 Address . . . . . : fe80::d088:d12:13b3:4304%14(Preferred)     IPv4 Address. . . . . . . . . . . : 192.168.1.9(Preferred)     Subnet Mask . . . . . . . . . . . : 255.255.255.0     Lease Obtained. . . . . . . . . . : Friday, July 24, 2020 11:28:41 PM     Lease Expires . . . . . . . . . . : Saturday, July 25, 2020 11:28:40 PM     Default Gateway . . . . . . . . . : fe80::4aee:cff:fe03:5cea%14                                         192.168.1.1     DHCP Server . . . . . . . . . . . : 192.168.1.1     DHCPv6 IAID . . . . . . . . . . . : 234889605     DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-26-AB-E3-DA-00-21-85-6B-B8-8D      DNS Servers . . . . . . . . . . . : 192.168.1.1     NetBIOS over Tcpip. . . . . . . . : Enabled 
Tunnel adapter isatap.domain.name:      Media State . . . . . . . . . . . : Media disconnected     Connection-specific DNS Suffix  . :     Description . . . . . . . . . . . : Microsoft ISATAP Adapter     Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0     DHCP Enabled. . . . . . . . . . . : No     Autoconfiguration Enabled . . . . : Yes
I also want to add this: even when Ethernet cable is not connected to my pc (so there is no connection between the pc and router) the internet light on my router turns off as soon as I turn my computer on!
And dsl light goes blinking.
It all goes back to normal when I turn the pc off. I checked the pc and router power wires and they were not tangled.

Run "ipconfig /all" via the Command Prompt and post the results.
 

Ralston18

Titan
Moderator
I was not able to view the results of "ipconfig /all".

Please try again. Run and do a copy and paste. [Ctrl C and Ctrl V].

Also:

Go back one step.

Ensure that only one network adapter - either wired or wireless - is enabled.

For the most part, physical cable entanglement is not an issue.
 

Wolfshadw

Titan
Moderator
I got it:

Windows IP Configuration

Host Name . . . . . . . . . . . . : My-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : domain.name

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : domain.name
Description . . . . . . . . . . . : Realtek PCIe GbE Family Controller
Physical Address. . . . . . . . . : 00-21-85-6B-B8-8D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d088:d12:13b3:4304%14(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.9(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Friday, July 24, 2020 11:28:41 PM
Lease Expires . . . . . . . . . . : Saturday, July 25, 2020 11:28:40 PM
Default Gateway . . . . . . . . . : fe80::4aee:cff:fe03:5cea%14 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 234889605
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-26-AB-E3-DA-00-21-85-6B-B8-8D
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.domain.name:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Not sure what all this means (I'm hardware, not network).

-Wolf sends
 
Jul 23, 2020
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10
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I was not able to view the results of "ipconfig /all".

Please try again. Run and do a copy and paste. [Ctrl C and Ctrl V].

Also:

Go back one step.

Ensure that only one network adapter - either wired or wireless - is enabled.

For the most part, physical cable entanglement is not an issue.
Sorry, I thought it would be more readable if I used code style. Wolfshadw has sent the full log.

I only have one network adapter (my pc is old and doesn't have a wifi). I checked it in my control panel.
But as you can see (in Wolfshadw's previous post) when I use ipconfig /all there are two adapters showing up: ethernet adapter and tunnel adapter.
 

Ralston18

Titan
Moderator
Thank you.

Does the following link match the router you are using?

https://in.dlink.com/en/products/dsl-2730u-wireless-n150-adsl2-router

What modem/router port are you using to connect the old pc?

On your old pc try running "ipconfig /flushdns" via the command prompt.

Failing that there are still other things to try:

=============

Regarding "tunnel adapter":

https://pupuweb.com/solved-execute-ipconfig-tunnel-adapter-media-disconnected-state/

If your ISP does not support IPv6 then no need for the "adapter". Even if supported, disabling IPv6 may stabilize connectivity.

Just as a matter of elimination try Solution 3 first, then Solution 1.

Do not edit the Registry (Solution 2). Registry editing is a last resort and should be undertaken only if you are fully prepared to reinstall the entire OS and all data.
 

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