[Live-devel] setupDatagramSocket - SO_REUSEADDR problems

[Rawling, Stuart]

Hi,

I tried an experiment running 2 openRTSP processes in the testProgs folder.
They connected to the same URL (an Axis Camera), and they both used the same
client_ports.  The server handled the connection on different ports, but the
client_port reported in the Transport Section were the same.

Should this be the case on separate processes?

Stuart

On 3/10/09 6:56 PM, "Ross Finlayson" <finlayson at live555.com> wrote:

>> >Hi,
>> >I've found that in some cases (it seems to be random) the method
>> >mediaSubsession::initiate will use the same UDP ports for both a
>> >video stream and an audio stream. A sample output for the openRTSP
>> >program is the following:
>> >
>> >
>> >Created receiver for "video/MP4V-ES" subsession (client ports 34394-34395)
>> >Created receiver for "audio/PCMU" subsession (client ports 34394-34395)
>> >Setup "video/MP4V-ES" subsession (client ports 34394-34395)
>> >Setup "audio/PCMU" subsession (client ports 34394-34395)
>> >
>> >
>> >The problem seems to be the SO_REUSEPORT socket option on the
>> >setupDatagramSocket function.
>> >So, my question is: Is it safe to disable that option?
> 
> The SO_REUSEPORT option is intended to allow more than one process -
> on the same host - to use the same (explicit) socket number.  For
> example, it allows more than one application to receive the same
> multicast stream, or, in the case of a unicast stream, it allows a
> different process to receive it than the actual RTSP client (e.g.,
> the "-r" option to "openRTSP").  It should not be allowing the OS to
> hand out the same ephemeral port number more than once.  If your OS
> is doing this, then it may be buggy.
> 
> If you're not anticpating any other process on the client host from
> receiving the stream, then you could probably get away with not
> setting SO_REUSEPORT.  However, fixing your buggy OS is probably the
> better option :-)
> 
> --
> 
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel
> 



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