Server with loopback only using iptables

# list iptables rules
sudo iptables -L

# clear iptables rules
sudo iptables -F INPUT

#start server
busybox nc -l -p 8888

# connect with client
busybox nc localhost:8888
busybox nc 127.0.0.1:8888
busybox nc 192.168.1.158:8888

# block incoming traffic on port 8888
sudo iptables -A INPUT -p tcp --dport 8888 -j REJECT

#allow loopback
sudo iptables -A INPUT -i lo -j ACCEPT

#start server
busybox nc -l -p 8888

# connect with client - now only working with localhost
busybox nc localhost:8888
busybox nc 127.0.0.1:8888
busybox nc 192.168.1.158:8888



# clear iptables rules
sudo iptables -F INPUT
# list iptables rules
sudo iptables -L