So this is the rooting process.. it worked on mine it'll work on yours(U need a PC to execute this)
IN THE LINKS REPLACE 'xxx' WITH 'www'
1. Download Superoneclick 2.2 [By xda-developers]
This is what will root ur device so download from here :-
SuperOneClickv2.2-ShortFuse.zip - 4shared.com - online file sharing and storage - download
After downloading extract it anywhere you please. Now go to ur system folder i.e where you have installed your OS (i.e Win xp, win 7 etc) Lets say its in the 'X' Drive. So go to X:/WINDOWS/system32/cmd.exe and copy it, now go to where you installed Superoneclick. Inside the folder there'll be a folder as "ADB" open it and paste the 'cmd.exe' you copied.
2. Now you need the LG ADB Drivers
Download the drivers and install it:-
It is recommended that you restart after installing the drivers.
3. Connect your Device
After installing the Drivers Connect Your Optimus Net using the data cable. In your Device go to settings>Applications>Development>USB Debbuging. Check the box beside it. It will give you a warning just click OK. When you connect your Device you will see 'Turn USB storage on" option DO NOT TURN IT ON. After connecting you will see in the notification bar that "USB Debbuging On" it means you have done evrythng ok uptil now.
Now before rooting Go to settings>Storage>Unmount SD Card it will ask you if you want to unmount click OK. After it is unmounted you can begin rooting. MAKE SURE YOU UNMOUNT THE SD CARD OTHERWISE IT MAY BE COMPLETELY ERASED.
4. Now Let's Root
Now Go to the ADB folder. Remember the cmd.exe you pasted there? Click on it.
WINDOWS 7 USERS MAKE SURE BEFORE CLICKING CMD YOU RIGHT CLICK AND CLICK ON 'RUN AS ADMINISTRATOR' AND ALLOW
In the commands write the following:- [Give the exact spaces i have given OTHERWISE IT WILL NOT WORK!!]:-
adb devices (press enter)(after this command you should see your device id)
adb shell (press enter) (after this command you should see $ sign)
$ echo 1 > /data/local/lge_adb.conf, (press enter)
DO NOT CLOSE THE WINDOW JUST MINIMIZE IT!!
Now go to Where you extracted Superoneclick and click on superoneclick.exe.
In the window on the Top Left hand Side of the window there will be an option 'ROOT'.
CLick on it!
When the process completes you will see a Dialog box asking that the rooting is done and if you want to install Superuser,click on OK both times. After this make sure YOU RESTART YOUR DEVICE. Once you restart you will see a new app as Superuser in the Menu. Click on it and click allow when it prompts.
Hence, you have a rooted Optimus Net do whatever you want