Linux: How To Find the Default Gateway

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.

courtesy http://www.tech-recipes.com/rx/2724/linux_how_to_find_default_gateway/