![]() ![]() When the router reboots, all dynamic mappings are lost. This is an incomplete implementation of the specification. The code is fairly well-documented, so consult the NATPMP.py file for usage details. The functions map_port and get_public_address provide the two high-level functions offered by NAT-PMP. The library provides a set of high-level and low-level functions to interact via the NAT-PMP protocol. Remember to turn off your firewall for those ports that you map. Invoke the client on the command-line (Terminal.app) as python natpmp-client.py public_port private_port.įor example: python natpmp-client.py -u -l 1800 60009 60009 Create a mapping for the public UDP port 60009 to the private UDP port 60009 for 1,800 seconds (30 minutes) python natpmp-client.py 60010 60010 Create a mapping for the public TCP port 60010 to the private TCP port 60010 python natpmp-client.py -g 10.0.1.1 60011 60022 Explicitly instruct the gateway router 10.0.1.1 to create the TCP mapping from 60010 to 60022 Make sure you have the library in the same directory as the client script or otherwise on your Python instance’s sys.path. To use the client, grab it and the above library. I’d love knowing where this code ends up (just out of personal curiosity), if you drop me a line, but that’s quite optional. The code is BSD licensed, so feel free to take it. Older AirPort utility software may have this option hidden elsewhere.) (To enable NAT-PMP on the AirPort router, go to AirPort Utility.app -> Internet -> NAT -> Enable NAT Port Mapping Protocol. Py-natpmp-0.2.1.tar.gz – a proper Python setuptools package for py-natpmp, if you’re rather take a tarball. If you want the unpackaged source code, you can find the latest versions there. Thus, I won’t forget to delete the mapping later (and reboot the router yet again) when I want that port secured behind the NAT. Furthermore, when I’m done with testing my server, I stop renewing the port mapping, and it expires when its lifetime runs out. When my server runs, it can make a call to the router to start forwarding a port. Further, there isn’t a command-line tool to open up a port when you’re SSH’ed into your machine but don’t have a GUI.Ĭreating the port mappings dynamically via NAT-PMP allows port forwarding to happen without the reboot. There has been no good way to do this programmatically with AirPort routers, when your program needs to negotiate a port forwarding with no manual intervention. Normally, when you need to have a public port on your router forwarded to a private port on your box behind it (say, if you write a server that listens on a port, or have a P2P client running on a port) you’d have to fire up AirPort Utility.app -> Advanced -> Port Mappings, set your mappings, and then hit Update…which reboots the router, killing your network connection and anything you might be doing. ![]() I needed to establish port forwarding without rebooting my AirPort router. In any case, this library puts a thin layer of Python abstraction over the NAT-PMP protocol, version 0, as specified by the NAT-PMP draft standard. I’m currently unable to support UPnP (the dominant port mapping protocol in non-Apple routers), though I’m sure either someone has written bindings for Python, or I’ll have to do it eventually once my AirPort Express dies. In practical terms, this is basically limited to the newer Apple AirPort base stations and the AirPort Express, which have support for this protocol. Thus this is a means for dynamic NAT traversal with routers that talk NAT-PMP. The client allows you to set up dynamic port mappings on NAT-PMP compatible routers. ![]() I wrote a NAT-PMP (Network Address Translation Port Mapping Protocol) library and testing client in Python. Something that I’ve put together and might be somewhat useful to others. ![]()
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