Re: [Ccrtp-devel] RTP Multicast TTL

[Arjan Knepper]

Tom Anwyll wrote:

> Hello RTP Gurus,
>
> Pardon my ignorance and inexperience.
>
> It is my understanding of multicast that the time to
> live (TTL) option determines the number of times a
> multicast packet will be routed beyond the network the
> packets originate from.
>  
yes, basically.

> However, I can not determine the method to set the TTL
> for multicast RTP session transmitters in ccRTP.
>  
in rtp.h: class TRTPSessionBase

   inline Socket::Error
   setMcastTTL(uint8 ttl)
   {
       Socket::Error error = dso->setMulticast(true);
       if ( error ) return error;
       error = dso->setTimeToLive(ttl);
       if ( error ) return error;
       error = cso->setMulticast(true);
       if ( error ) return error;
       return cso->setTimeToLive(ttl);
   }

This member is private though. (Why ??) But the 'dso' and 'cso' are
protected so in your derived class you should be able to access them.


> If possible, could someone explain to me how to set
> TTL in ccRTP for multicast RTP session transmitters? 
>
> If it is not possible to set TTL in ccRTP, doesn't
> this limit ccRTP for use only in local networks? How
> would multicast RTP transmitted packets get routed to
> multiple networks?
>
> Thanks (in advance) for the explanation,
> Tom
>
>
>
>
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