what is the use of /etc/udev/rules.d/70-persistent-net.rules file in linux? is anyother way to change interface name in linux other than 70-persistent-net.rules?
This file associates your NIC's MAC address with an interface name that will be given to the NIC at startup. There are certainly ways to change the name at runtime but if you reboot, it's gonna be the contents of that file that count.
I guess you refer to the new interface names!?!
My DC technican strongly advised to change software / scripts instead of the adapter names. I do not have an explaintation for this yet, but i guess the new naming is more precise.
A few days ago i made this post after bugging with an "outdated script". http://www.reddit.com/r/sysadmin/comments/30xukg/rip_eth0_say_hello_p1p1/
PS: probably edit the question to avoid a duplicate http://askubuntu.com/questions/505421/explanation-of-70-persistent-net-rules-script