I've set up OpenVPN on my Debian server and would like to add a rule to iptables. I already have a file that lists default filter rules that iptables reads from (pre-up). I tried adding the rule to the file like so:
*filter # Default firewall rules are here COMMIT *mangle -A POSTROUTING -s 10.8.0.0/24 -o wlan0 -j SNAT --to-source 192.168.1.230 COMMIT
I then try to apply the rules with:
sudo iptables-apply /etc/iptables.firewall.rules
and it fails.
For reference, I followed this tutorial but don't want to use the shell script because it also failed to apply the mangle rule.