How To Change eth1 to eht0 or vice versa:
Step1: Open A console (CTRL+ALT+F2), login with your username and password, get root by typing: sudo su - and your password when asked.
Step2: type at the console nano /etc/iftab
Here you will see this:
# This file assigns persistent names to network interfaces.
# See iftab(5) for syntax.
eth0 mac 00:0e:2e:84:d8:37 arp 1
eth1 mac 00:14:2a:f8:52:ad arp 1
just put eth1 instead of eth0 and vice versa just like this:
# This file assigns persistent names to network interfaces.
# See iftab(5) for syntax.
eth1 mac 00:0e:2e:84:d8:37 arp 1
eth0 mac 00:14:2a:f8:52:ad arp 1
Step3: Save&Close the file ( CTRL+O, CTRL+X)
Step4: Reboot the PC
Now the former eth1 card will be eth0 and eth0 will be eth1.