-tun-old: dict argument
- device (string): optional, path of TUN/TAP device file ["/dev/tun*"]
- interface (string): optional, name of tunnel network interface
- interface-search (bool): optional, whether to search for a free tunnel
- interface (True if 'device' not specified, otherwise False)
- ifconfig-path (string): optional, path to ifconfig command
- route-path (string): optional, path to route command
- plus generic netlink options, as for 'null-netlink'
-
- I recommend you don't specify the 'interface' option unless you're
- doing something that requires the interface name to be constant.
+I recommend you don't specify the 'interface' option unless you're
+doing something that requires the interface name to be constant.