[Live-devel] issue with a streaming server having multiple network interfaces

Marc Neuberger mjn at oxysys.com
Tue Nov 13 21:08:13 PST 2007

Ross Finlayson wrote:
>> I have tried it (I am having problems with a multiple-interface 
>> machine). It seems to get halfway there: We now compute the 
>> Content-Base URL appropriately (and source= element in the RTSP 
>> SETUP reply [though the o= line of the SDP still has a different IP 
>> address. This may be appropriate, I don't have a clear idea of how 
>> it is used, if at all.]. However, the RTP and RTCP packets come from 
>> the "wrong" IP address, i.e. not necessarily the IP address of the 
>> interface that the connection was made to.
>> It seems that some firewalls block all of the UDP traffic under 
>> these circumstances. The UDP sockets need to be bound to the 
>> appropriate interface, rather than INADDR_ANY, to ensure that they 
>> come from the correct IP address.
> You can do this by modifying your code to set 
> "ReceivingInterfaceAddr" at the start.
The problem is that I want to be able to accept RTSP connections from 
*all* of the interfaces. So the UDP sockets need to be bound on a 
per-connection basis, depending on what interface the RTSP came in on. 
If I understand correctly, ReceivingInterfaceAddr is a static global, so 
it would set the interface once and for all.

Marc Neuberger
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