#linux networking

June 28th, 2023

In Rasbian 11, you use dhcpcd (note the extra ‘c’ in that name). You add hooks, scripts that run after the dhcp client runs. If you read the man pages for dhcpcd, you’ll find that the hooks are located in /lib/dhcpcd/dhcpcd-hooks/. You’ll find files that start with numbers which defines the execution order woth low numbers being executed first. I added my ‘route add’ command to a file I called 70-routeadd and rebooted. Magic.

Try searching on how to add a persistent route to Raspbian 11 and you’re 99% likely to find old, wrong answers. The reason is there are several ways, some no longer really supported, to manage networking. The venerable interfaces method is deprecated, as near as I can tell, but you can still find the configuration structure and services in a brand new default installation. Network configuration has moved to DHCP even for static addresses.

There is the dhclient set of utilities, configuration files, and the service daemon for it. It won’t work either and I have no idea why its installed. I stumbled across the dhcpcd daemon looking at a list of services and finally decided its something different from dhclient. After reading the man pages, I figured it was a shot in the dark and followed it and Voila! Success.

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For todays article I am going to explain how to create a basic firewall allow and deny filter list using the iptables package. We will be focused on creating a filtering ruleset for a basic everyday Linux web server running Web, FTP, SSH, MySQL, and DNS services.