Rename Network Interface Name

To rename a network interface permanently on Linux in a simple boot script, do following:

Example: Rename interface "eth1" (NET2) to "ethercat0"

1.  Connect to the device by SSH (ex. Putty)

2. Create a script:
   Command: nano /etc/init.d/rename-net2.sh

3. Script content:
   ifconfig eth1 down
   ip link set eth1 name ethercat0
   ifconfig ethercat0 up

   "ethercat0" is the new name of the interface name

4. Quit editor and save content. CTRL-X --> Y --> Enter --> Enter

5. Set the execution rights.
   Command: chmod +x /etc/init.d/rename-net2.sh

6. Automticly exceuted scrip on boot time
   Command: update-rc.d rename-net2.sh defaults

7. Flash file system.
   Command: sync

8. Now on each booting the interface will be rename to "ethercat0"