Debian 4.0 doesn’t have an /etc/rc.local file, so if you’re used to adding your own startup scripts to /etc/rc.local then you will need to add this file manually as follows:
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This will create an /etc/init.d/rc.local (needed for Debian to work properly) file, and add a rule to restore the custom iptables rule that I have saved in the /root/ folder.
Then we make the file executable, and lastly update the rc environment to detect & use rc.local as a startup file. On the last line I have some numbers: “99“, “2“, “3“, “4” & “5” – this tells the update script to run the script very last the start-up sequence (i.e. #99), and then activate it for run levels 2,3,4 & 5.
