John,
Multicast by nature will "flood" to every port on a LAN/WAN, till the
TTL reaches 0 or until it reaches a multicast aware router that will
route the traffic or drop it. If you are not wishing to flood your
stream to your ISP you can set the TTL of your stream in the broadcast
program to 1. If your airport base station is not set up to bridge the
networks (Layer2) but route traffic (Layer 3) it will decrement the TTL
and drop the packets before it is sent to your ISP. If you are wanting
to send the traffic to your ISP and they have multicast aware routers
then your stream may be larger (BPS) than your Airport base station
available uplink bandwidth to your ISP, and you will need to encode a
smaller movie.
Another possibility, I don't know if you can configure quality of
service(QOS) on the airport, but on an Enterasys or Cisco router you can
set the router to filter on the QOS bit so that the multicast stream is
a lower priority so it will be dropped and the other network traffic on
the line will be able to get through. However this will cause the movie
received on the clients to be more choppy.
Micah Coleman
Multicast Routing Test / PIM Escalations
Enterasys Networks
Email: email@hidden
www: http://www.enterasys.com
-----Original Message-----
From: John Michael Zorko [mailto:email@hidden]
Sent: Wednesday, February 26, 2003 6:32 PM
To: Hi all
Subject: multicast and router config?
Hello, all ...
I have a program which streams MPEG audio / video over IP multicast.
When I run said program on my iBook 700 (OSX 10.2.4) on my home
network, it floods the network, such that no other home machine can get
out. The same thing happened the other night when I ran it after
attaching said iBook to a friend's (wired) network i.e. no one could
ping yahoo.com until after I stopped said program.
I'm no stranger to BSD sockets, streaming and network programming, but
i'm new to IP multicast and router config stuff. At home, the router
is an Airport Base Station (snow, non-Extreme). How can I configure it
(or my iBook) so that I can still perform my multicast experiments,
while still allowing other boxes to get out?
Regards,
John
Falling You - exploring the beauty of voice and sound
New EP, "hope thrown down," available now at
http://www.mp3.com/fallingyou
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