Re: [Ccrtp-devel] RTP Multicast TTL

[Federico Montesino Pouzols]

Ooops, I'm afraid this didn't get to the list...

On Sat, Jan 21, 2006 at 05:24:12PM +0100, Federico Montesino Pouzols wrote:
> 
> Hi, 
> 
> I think this is one of the points where the current API may be too
> restrictive. I think setMcastTTL should be made protected an also that
> an additional 'default TTL' optional parameter should be added to the
> multicast constructor of the TRTPSessionBase template. That way, the
> public interface would provide a means to select the TTL at
> construction time and the protected interface would allow for custom
> changes of the TTL.
> 
> I would introduce this change together with some others shortly, or
> are ther any other suggestions?
> 
> On Tue, Jan 17, 2006 at 11:41:37AM +0100, Arjan Knepper wrote:
> > 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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> > 
> > 
> > 
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