Windows

We will perform the shift through the utility CMD.

You must first open a command prompt as administrator. Then use the appropriate command to view all existing network interfaces and values MTU.

netsh interface ipv4 show subinterfaces

That’s pretty much the conclusion.

Where 1500 (default) is the MTU value. Ethernet — standard interface name.

Next, change the MTU value with a special command:

netsh interface ipv4 set subinterface "Ethernet" mtu=1400 store=persistent

Where Ethernet is the name of the network interface.

1400 - New MTU value set.

Get the result.

Debian / Ubuntu

Enter command to edit configuration of network interfaces, will use Nano:

nano /etc/network/interfaces

Then add at the end of the network interface mtu 1400

Press Ctrl + X, then Y to save the changes.

Enter the command to restart the network service:

systemctl restart networking