instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from manipulating iptablesIntegration with firewalldDocker and ufwOn Linux, Docker creates iptables and ip6tables rules to implement network
  isolation, port publishing and filtering.Because these rules are required for the correct functioning of Docker bridge
  networks, you should not modify the rules created by Docker.But, if you are running Docker on a host exposed to the internet, you will
  probably want to add iptables policies that prevent unauthorized access to
  containers or other services running on your host. This page describes how
  to achieve that, and the caveats you need to be aware of.
  NoteDocker creates iptables rules for bridge networks.No iptables rules are created for ipvlan, macvlan or host networking.Docker and iptables chainsIn the filter table, Docker sets the default policy to DROP, and creates the
  following custom iptables chains:DOCKER-USERA placeholder for user-defined rules that will be processed before rules
  in the DOCKER-FORWARD and DOCKER chains.DOCKER-FORWARDThe first stage of processing for Docker's networks. Rules that pass packets
  that are not related to established connections to the other Docker chains,
  as well as rules to accept packets that are part of established connections.DOCKERRules that determine whether a packet that is not part of an established
  connection should be accepted, based on the port forwarding configuration
  of running containers.DOCKER-ISOLATION-STAGE-1 and DOCKER-ISOLATION-STAGE-2Rules to isolate Docker networks
  ```