Ethernet (LAN) not working

[Xantosh]

Hello I got problem with my ethernet cable connection.
I dont think i have problem with my Ethernet drivers.... I have updated it to latest version.

This is the Screen shot  of Wifi Details & Ethernet Details... I saw there that Ethernet is not getting IP automatically...
I tried putting IP manually but it still doesn't work.

But it had worked 2 times within this last week, one time when i try to boot my OS in network mode... And another was when i uninstall my Realtek PCIe FE Family controller driver and reinstall it.... But after next time I turn ON my laptop, by applying same method its not working now.... I check ethernet cable working fine on another brand laptop but not on HP laptop.... tested on 2 HP laptop. Also in windows 10,  i suffer same problem so i installed window 7 in hope of it may work but its same.... HELP ME....

[jorkki]

You didn't say what equipment it is that you are connecting to?

Anyway, a lot of the time the cables that are delivered with e.g. the WiFi routers are crappy and not  really working well at all with 1Gb speeds. The speed is usually autonegotiated between the devices.

Another thing is the autonegotiation of which pins to use for transmit and which for receive.

Traditionally a straight through cable is used to connect a node (PC) to a network device (switch or router) with a straight through cable (pin 1 to 1, pin 2 to 2, pin 3 to 3 and pin 6 to 6) but these days the devices can usually autonegotiate so that a crossover cable can also be used.

Put a bad cable in this equation and the autonegotiations easily fail.

What you can do is to lock the speed at say 100Mbps at the PC end and see if it helps if you don't have another cable to try with.

Do as follows:

Start Device Manager (Right click on the Windows icon, select Device Manager)

Right click on the Realtek GBE

Select Advanced

Select Speed&Duplex

Select 100Mbps Full duplex

If this does not help, you should probably get a better cable (or even if it does).

If it does not help, see that your cable is straight through and not a cross-over cable. In a cross-over cable the pair 1-2 goes to 3-6 in the other end and vice versa.