Ethernet does not work when connected to docking station (E-port)

I fought with this problem for many hours and the ONLY thing that gave me a reliable ethernet connection was to force the port to 100Mb/Full.  Gigabit speed never worked reliably as it would disconnect for a few seconds every couple minutes.  None of the suggestions in this thread helped.  I'm on Linux.

The disable Energy Efficient Ethernet option is the only setting that has resolved this issue for me (on an E7470). Our IT department recommending installing all of the latest recommended Windows updates. I did so but there was no change in the lack of auto-connect functionality.

This issue is finally fixed on Linux kernel 5.3.  I'm now seeing stable gigabit ethernet on my e5570 when docked.

For full 1Gbps I also needed this:

ethtool -K eth0 tso off gso off

Ref:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=def4ec6dce393e2136b62a05712f35a7fa5f5e56

The fix provided by @MohamedUvaiz  worked for me.

Some background:

I'm using a D6000 dock with an XPS13 2019 laptop.

For the original dock, I had updated the firmware and all drivers related to ethernet.  Likewise I had updated all drivers for the XPS related to network/ethernet.  Yet I was unable to access my network at work or internet.

Dell provided a new D6000 but I was still unable to access the internet (although this time I was apparently able to access the network).  I also updated the firmware and drivers for the new dock.  Still no success.

Following Mohamed's advice, I entered the MAC address printed on the label under the dock (without dashes) and it worked!

(Note using the pass-through MAC address (the one my network actually sees) did not work.)

Thanks very much to @MohamedUvaiz !!!

Latitude E7450 and E-Port Plus (PR02X) with original power supply. I have to reduce connection speed to 10 Mbit/s full duplex to get a stable connection. I bought a second docking and it is the same. Tested with actual dr4iver and 12.15.23.1 from 2016.