Raspberry Pi - IP Check

[rustikles]

I'd like to add a script to crontab for my Pi that:

1. checks the current external IP of the device
2. issue a 'sudo reboot' if the IP returned is within a certain range e.g. '70.x.x.x --> 75.x.x.x'

This may seem like overkill, but I'm just going to assume that if the VPN is no longer connected, there was some kind of network disruption that may have affected other parts of the system (e.g. drive mappings) as well. Hence, the reboot.

 

Specifically, my Pi is running as an VPN client, and I'm trying to check to make sure traffic is being actually routed through the VPN. I'd just as soon make some kind of firewall rule to only allow VPN traffic, but that won't automatically refresh the network connection if traffic isn't being routed as desired.

 

Would anymore mind throwing together a few lines of code to give me an example of how it could work? 

 

EDIT: If it saves some time, this should return the current external IP:

wget http://ipecho.net/plain -O - -q ; echo

[burnttoastnice]

This API will show your public IP: https://api.ipify.org/. You could run a cronjob to power-cycle the network interface card? Is your pi connecting to the network through WiFi or Ethernet? (Wifi connections on the Pi do not stay active, they always drop after an inactivity period due to kernel-based power saving features)