I’ve been trying to use code to solve more problems around the lab lately, and thought I’d start posting some of the little scripts I write. Today I had plugged a device (device A) into a switch and didn’t know what the device had set for its gateway (I did have the IP of the device itself, and it wasn’t .1 or .254). I didn’t have access to the configuration, so I thought I’d write a script to go through possible IP addresses and see if one of them would take until the owner got back to me. I had another machine trying to ping the IP address from a different subnet, so if the right gateway address was configured on the Ethernet port, I should start getting pings:
Device A — Switch — Test pinging machine
Now I started my constant ping from 220.127.116.11 to 18.104.22.168, then I created and ran this Python script to find the right address.