#!/bin/bash

# Check that two arguments were provided
if [ $# -ne 2 ]; then
  echo "Usage: $0 port1 port2"
  exit 1
fi

# Set variables for the two ports
port1=$1
port2=$2

# Create bidirectional tunnel between the two ports using socat
socat TCP-LISTEN:$port1,fork TCP:localhost:$port2 &
socat TCP-LISTEN:$port2,fork TCP:localhost:$port1 &

# Redirect outgoing traffic from port1 to port2 using iptables
iptables -t nat -A OUTPUT -p tcp --dport $port1 -j REDIRECT --to-port $port2