Opennetworking configuration file /etc/network/interfaces:
sudo nano /etc/network/interfaces
Setup post-up option, append following line to eth0 configuration section:
post-up /etc/network/if-up.d/fw.dsl.start
To run command After bringing the interface up, enter:
post-up command
To run command before bringing the interface up, enter:
pre-up /scripts/networking.accounting_on
To run command before taking the interface down, enter:
pre-down command
To run command or script after taking the interface down, enter:
post-down /path/to/script.sh