Linux: How To Find the Default Gateway
Contributed by Rob Rogers 
Tagged: Linux networking Whether you’re troubleshooting network problems or trying to set up a VPN, knowing what address your computer has configured as the default gateway is always useful. Running a simple command from the terminal can give you this.
1. Open a terminal window.
2. Input the following command and hit Enter:
route -n
3. The address contained in the last line (with the UG flag) is the address for your default gateway.
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ajit rai said on February 15, 2010
thank you
pls add some more useful data.
Calucop said on July 27, 2011
but if reboot the system. it loss default gateway