instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from the
  IPv6 documentation range.Option ipv6 is required.Option bip6 is optional, it specifies the address of the default bridge, which
  will be used as the default gateway by containers. It also specifies the subnet
  for the bridge network.Option fixed-cidr-v6 is optional, it specifies the address range Docker may
  automatically allocate to containers.The prefix should normally be /64 or shorter.For experimentation on a local network, it is better to use a Unique Local
  Address (ULA) prefix (matching fd00::/8) than a Link Local prefix (matching
  fe80::/10).Option default-gateway-v6 is optional. If unspecified, the default is the first
  address in the fixed-cidr-v6 subnet.
  
  {
   "ipv6": true,
   "bip6": "2001:db8::1111/64",
   "fixed-cidr-v6": "2001:db8::/64",
   "default-gateway-v6": "2001:db8:abcd::89"
  }If no bip6 is specified, fixed-cidr-v6 defines the subnet for the bridge
  network. If no bip6 or fixed-cidr-v6 is specified, a ULA prefix will be
  chosen.Restart Docker for changes to take effect.Connection limit for bridge networksDue to limitations set by the Linux kernel, bridge networks become unstable and
  inter-container communications may break when 1000 containers or more connect
  to a single network.For more information about this limitation, see
  moby/moby#44973.Skip Bridge IP address configurationThe bridge is normally assigned the network's --gateway address, which is
  used as the default route
  ```