[SR-Users] systemd - properly starting up rtpengine with kernel forwarding

Hello, do people here have (implemented) special ways to properly start rtpengine with kernel forwarding after system reboot? """ A typical start-up sequence including in-kernel forwarding might look like this: # this only needs to be one once after system (re-) boot modprobe xt_RTPENGINE iptables -I INPUT -p udp -j RTPENGINE --id 0 ip6tables -I INPUT -p udp -j RTPENGINE --id 0 # ensure that the table we want to use doesn't exist - usually needed after a daemon # restart, otherwise will error echo 'del 0' > /proc/rtpengine/control # start daemon /usr/sbin/rtpengine --table=0 --interface=10.64.73.31 --interface=2001:db8::4f3:3d \ --listen-ng=127.0.0.1:2223 --tos=184 --pidfile=/run/rtpengine.pid --no-fallback """ I was relying on shell scripts executed on boot time, but now that systemd is more common, I am looking to see what are "standard"/"recommended" ways for running additional scripts besides the start/stop daemon, which makes it also easier to build packages not worrying about the type of OS and how it can run scripts at startup. Systemd seems to have the "ExecStartPre" option, is it what people use to ensure the rtpengine kernel module is loaded and iptables rule exists? Any systemd-specific wayt to run a script only once after system boot? I have seen workarounds on the net for creating like a rc.local service, but they didn't look to be systemd-native, ... Not strictly related, but if someone is aware or had some experiences with,  I am curious if "echo 'del 0' > /proc/rtpengine/control" is really needed because on a system where I forgot to have it in the scripts (well, was commented), I haven't noticed any issues after rtpengine restarts. Cheers, Daniel -- Daniel-Constantin Mierla -- www.asipto.com www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio World Conference - April 27-29, 2020, in Berlin -- www.kamailioworld.com