Create a TUN tunnel

Usage:
  narrowlink tun [OPTIONS]

Description:
  Creates a TUN interface to connect to a remote endpoint
   ***          Experimental and Unreliable          ***
   **      Use it at your own risk and discretion     **
   *This is a work in progress and not production ready*

Examples:
  narrowlink tun -n <agent name>
  narrowlink t -gdn <agent name> -k <key> -m <ip>=<ip>

Options:
  -g, --gateway     Use as default gateway
  -d, --direct      Direct connection to the remote endpoint (peer-to-peer)
  -r, --relay       Relay connection to the remote endpoint (peer-to-gateway-to-peer)
  -n, --name=       The name of the agent (required)
  -k, --key=        The secret key for end-to-end encryption
  -l, --local=      The local address to bind to
  -m, --map=        Map an IP address