[Live-devel] Multicast Interface

[Anthony Clark]

On Wed, Oct 29, 2014 at 2:02 PM, Ross Finlayson <finlayson at live555.com>
wrote:

> Thanks for the reply. I know how routing works ;)
>
>
> Well, your use of a “@gmail.com” email address announces to the world
> that you don’t know much of anything (and it’s why your email to the list
> is moderated).  Just saying :-)
>
>
Haha! There are issues with gmail now? Sigh .. I figured I'd get less help
supplying my workplace address and not all of us have personal domains ;).
I'll do that from now on.


>
> I have one single interface in AP mode and the kernel will *never* choose
> it for mcast routing even though a route is present, mcast is enabled, etc.
>
>
> If you have a single interface on which IP multicast routing is enabled,
> but IP multicast doesn’t work, then that sounds like a bug in your system
> somewhere (perhaps a device driver).
>

It was an issue with kernel 3.13 ... updated to 3.15 and an opensource
driver. It's fixed for now. It's no longer a live555 issue.


>  Even a WiFi interface in Access Point mode (assuming that that’s what you
> meant by “AP mode”) should be able to send/receive IP multicast.
>

I had to stop assuming this sort of thing for 802.11 devices... especially
where only closed-sourced drivers exist.


>
> As I said before, setting one of your interfaces (but no other) to have a
> route for 224/8 is usually the most reliable way to have it chosen for IP
> multicast.  But if that doesn’t work, you can try setting the global
> variables “SendingInterfaceAddr” and “ReceivingInterfaceAddr” to explicitly
> set the interface that you want to use.  (But that’s definitely not 100%
> reliable either.)
>

As an aside - From a networked library writers perspective, I wonder when
it's appropriate to allow forcing an interface (ie - ignoring routing) ...
anyways. Thanks. This issue is closed.


>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
>
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> live-devel at lists.live555.com
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>
>
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