Re: RTP Multicast TTL

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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>  
>