[Twisted-Python] Getting local UDP address/port

exarkun at twistedmatrix.com exarkun at twistedmatrix.com
Sat Nov 14 10:11:50 EST 2009

On 03:02 pm, olivier.parisy at free.fr wrote:
>I am implementing a UDP protocol where a request is sent to a server
>through a connected UDP transport.
>I listen for the answer using reactor.listenUDP(0, myDatagramProtocol).
>The local port is not in itself significant (hence the 0), but the
>protocol require that I get the local IP address and port of the socket
>used to send the request (so that I can properly process the answser).
>How can I get this information ? datagramReceived only provides me with
>the source address and port of the answer (as can be expected).

The protocol's transport will give you this information via the getHost 


However, unless you're using connected UDP, the platform may not bother 
to give you a realistic local address (and perhaps sometimes even for 
connected UDP it won't).  And then there's always NAT.


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