instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from other networks is not allowed.In routed mode containers in other networks can use direct
  routing to access ports, without going via a host address.In routed mode, a host port in a -p or --publish port mapping is
  not used, and the host address is only used to decide whether to apply
  the mapping to IPv4 or IPv6. So, when a mapping only applies to routed
  mode, only addresses 0.0.0.0 or :: should be used, and a host port
  should not be given. If a specific address or port is given, it will
  have no effect on the published port and a warning message will be
  logged.Mode isolated can only be used when the network is also created with
  CLI flag --internal, or equivalent. An address is normally assigned to the
  bridge device in an internal network. So, processes on the docker host can
  access the network, and containers in the network can access host services
  listening on that bridge address (including services listening on "any" host
  address, 0.0.0.0 or ::). No address is assigned to the bridge when the
  network is created with gateway mode isolated.ExampleCreate a network suitable for direct routing for IPv6, with NAT enabled
  for IPv4:
  
  $ docker network create --ipv6 --subnet 2001:db8::/64 -o com.docker.network.bridge.gateway_mode_ipv6=routed mynet
  Create a container with a published port:
  
  $ docker run --network=mynet -p 8080:80 myimage
  Then:Only container port 80 will be open, for IPv4 and IPv6.For IPv6, using routed mode, port 80 will be open on the container's IP
  address. Port 8080 will not be opened on the host's IP addresses, and
  outgoing packets will use the container's IP address.For IPv4, using the default nat mode, the container's port 80 will be
  accessible via port 8080 on the host's IP addresses, as well as directly
  ```