I’m looking for an updated (Big Sur) MacOS alternative for this iptables command:

linux iptables

sudo sysctl net.ipv4.ip_forward=1

sudo iptables -t nat -I PREROUTING -p tcp --dport 55 -j REDIRECT --to-port 8080

E.g. allow port forwarding, and forward all tcp traffic destined to port 55 to a tcp proxy listening at 127.0.0.1:8080

Trying to accomplish the same, I got to the following on Mac:

mac pfctl

sudo sysctl -w net.inet.ip.forwarding=1

echo "rdr pass inet proto tcp from any to any port 55 -> 127.0.0.1 port 8080" | sudo pfctl -ef -

This however doesn’t work, and instead clogs the packets in a way that they never reach my proxy.

Any help appreciated.