instruction: Create a Dockerfile for networking
output: ```dockerfile
  from daemon: Address already in use.
  Manually create 802.1Q linksVLAN ID 40If a user does not want the driver to create the VLAN sub-interface, it needs to
  exist before running docker network create. If you have sub-interface
  naming that is not interface.vlan_id it is honored in the -o parent= option
  again as long as the interface exists and is up.Links, when manually created, can be named anything as long as they exist when
  the network is created. Manually created links do not get deleted regardless of
  the name when the network is deleted with docker network rm.
  
  # create a new sub-interface tied to dot1q vlan 40
  $ ip link add link eth0 name eth0.40 type vlan id 40
  
  # enable the new sub-interface
  $ ip link set eth0.40 up
  
  # now add networks and hosts as you would normally by attaching to the master (sub)interface that is tagged
  $ docker network create -d ipvlan \
   --subnet=192.168.40.0/24 \
   --gateway=192.168.40.1 \
   -o parent=eth0.40 ipvlan40
  
  # in two separate terminals, start a Docker container and the containers can now ping one another.
  $ docker run --net=ipvlan40 -it --name ivlan_test5 --rm alpine /bin/sh
  $ docker run --net=ipvlan40 -it --name ivlan_test6 --rm alpine /bin/sh
  Example: VLAN sub-interface manually created with any name:
  
  # create a new sub interface tied to dot1q vlan 40
  $ ip link add link eth0 name foo type vlan id 40
  
  # enable the new sub-interface
  $ ip link set foo up
  
  # now add networks and hosts as you would normally by attaching to the master (sub)interface that is tagged
  $ docker network create -d ipvlan \
   --subnet=192.168.40.0/24 --gateway=192.168.40.1 \
   -o parent=foo ipvlan40
  
  # in two separate terminals, start a Docker container and the containers can now ping one another.
  $ docker run --net=ipvlan40 -it --name ivlan_test5 --rm alpine /bin/sh
  $ docker run --net=ipvlan40 -it --name ivlan_test6 --rm alpine /bin/sh
  Manually created links can be cleaned up with:
  
  $ ip link del foo
  As with all of the Libnetwork drivers, they can be mixed and matched, even as
  far as running 3rd party ecosystem drivers in parallel for maximum flexibility
  to the Docker user.
  Request changesTable of contentsOptionsExamplesPrerequisitesIPvlan L2 mode example usageIPvlan 802.1Q trunk L2 mode example usageIPvlan L3 mode exampleDual stack IPv4 IPv6 IPvlan L2 modeDual stack IPv4 IPv6 IPvlan L3 modeManually create 802.1Q links
  
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