I use VPN client to connect to my corporate servers. It creates tun0 interface after starting the client. I've written script which install specific routes point to tun0 interface and rest to use normal wifi connection. So that, only my office related traffic goes via VPN and rest are goes via home internet connection. How do I make the script to run automatically when tun0 interface up/down events ?.
I am not sure about
tun0, but I think the script in
/etc/network/if-down.d/ are invoked when an interface goes up or down, respectively.
Inside the script you can determine which interface is interested from the content of the variable
To be sure, add a simple script to
/etc/network/if-up.d/ which content is
#!/bin/sh # filename: tun-up if [ "$IFACE" = tun0 ]; then echo "tun0 up" >> /var/log/tun-up.log fi
make it executable
sudo chmod +x /etc/network/if-up.d/tun-up
then see if the up events are recorded in
gksudo gedit /etc/network/interfaces
auto tun0 iface tun0 inet manual up COMMAND
COMMAND can be a command, like
ip route add something... or a script path with executable permissions (
chmod +x), eventually stored in
up you may use
The following "command" options are available for every family and method. Each of these options can be given multiple times in a single stanza, in which case the commands are executed in the order in which they appear in the stanza. (You can ensure a command never fails by suffixing them with "|| true".) pre-up command Run command before bringing the interface up. If this command fails then ifup aborts, refraining from marking the interface as configured, prints an error message, and exits with status 0. This behavior may change in the future. up command post-up command Run command after bringing the interface up. If this command fails then ifup aborts, refraining from marking the interface as configured (even though it has really been configured), prints an error message, and exits with status 0. This behavior may change in the future. down command pre-down command Run command before taking the interface down. If this command fails then ifdown aborts, marks the interface as deconfigured (even though it has not really been deconfigured), and exits with status 0. This behavior may change in the future. post-down command Run command after taking the interface down. If this command fails then ifdown aborts, marks the interface as deconfigured, and exits with status 0. This behavior may change in the future. There exists for each of the above mentioned options a directory /etc/network/if-<option>.d/ the scripts in which are run (with no arguments) using run-parts(8) after the option itself has been processed. Please note that as post-up and pre-down are aliases, no files in the corresponding directories are processed. Please use if- up.d and if-down.d directories instead. All of these commands have access to the following environment variables. IFACE physical name of the interface being processed LOGICAL logical name of the interface being processed ADDRFAM address family of the interface METHOD method of the interface (e.g., static) MODE start if run from ifup, stop if run from ifdown PHASE as per MODE, but with finer granularity, distinguishing the pre- up, post-up, pre-down and post-down phases. VERBOSITY indicates whether --verbose was used; set to 1 if so, 0 if not. PATH the command search path: /usr/local/sbin:/usr/local/bin:��� /usr/sbin:/usr/bin:/sbin:/bin Additionally, all options given in an interface definition stanza are exported to the environment in upper case with "IF_" prepended and with hyphens converted to underscores and non-alphanumeric characters discarded. When ifupdown is being called with the --all option, before doing anything to interfaces, if calls all the hook scripts (pre-up or down) with IFACE set to "--all", LOGICAL set to the current value of --allow parameter (or "auto" if it's not set), ADDRFAM="meta" and METHOD="none". After all the interfaces have been brought up or taken down, the appropriate scripts (up or post-down) are executed.
systemd to run a script after
sudo systemctl edit --force --full my-script.service:
[Unit] Description=My script after network available Wants=network-online.target After=network-online.target [Service] Type=simple User=root ExecStart=<path>/script.sh [Install] WantedBy=multi-user.target
sudo systemctl enable my-script.service
sudo systemctl start my-script.service