How to set up iptables in Linux using redsocks

ip-tables-linux-firewall-redsocks.md

Sources:

• https://pastebin.com/Hzu3frCE
• https://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/
• https://github.com/darkk/redsocks

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Checking redsocks service and config

cat /lib/systemd/system/redsocks.service
cat /etc/redsocks.conf

Setup iptables:

sudo iptables -t nat -N REDSOCKS

sudo iptables -t nat -A REDSOCKS -d 0.0.0.0/8 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 10.0.0.0/8 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 127.0.0.0/8 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 169.254.0.0/16 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 172.16.0.0/12 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 192.168.0.0/16 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 224.0.0.0/4 -j RETURN
sudo iptables -t nat -A REDSOCKS -d 240.0.0.0/4 -j RETURN

sudo iptables -t nat -A REDSOCKS -p tcp -j REDIRECT --to-ports 12345

Use redsocks chain for all the outgoing traffic

sudo iptables -t nat -A OUTPUT -p tcp -j REDSOCKS