All things related to multicast

[Toerless Eckert <>]

Hi *,

We have set up a beacon from the Nanog23 site to allow checking in
advance if multicast transmission works fine (both routing and
bandwidth). So far we could not get anything but routers into
the Oakland conference site, so we just have a router test application
sending empty UDP packets:
   
       "H.261": ~384 kbps -> 60 packets/sec at 800 bytes
                (65.174.250.11,233.24.11.1) port 25011
       "MPEG1": ~1 Mbps -> 160 packets/sec at 800 bytes
                (65.174.250.12,233.24.11.2) port 25012
       "MPEG2": ~5 Mbps -> 800 packets/sec at 800 bytes
                (65.174.250.13,233.24.11.3) port 25013

 Notes:  MPEG2 transmission is targeted at 4 mbps, just the beacon
 is 20% higher to be on the safe side. Also the packet sizes
 are set lower than the typical apps will give us to be on the
 safe side of performance - if the beacon get's through without
 loss, the actual video stream would too.

We'll try to let the beacon run until the conference begins, but
no guarantees.

The actual conference session info can be found on:
    http://www.nanog.org/mtg-0110/network.html#multi

Cheers
        Toerless

P.S.:


If you don't have a favourite router or host tool to receive and
count such void streams, then check out my own messy program in
ftp://ftpeng.cisco.com/eckert/push (no, i do not have a windows
binary, but yes, this is just a hack).

      push -c -r 233.24.11.1 -p 25011 -m 10 &
      push -c -r 233.24.11.2 -p 25012 -m 10 &
      push -c -r 233.24.11.3 -p 25013 -m 10 &

Should display:

Received   60 pps of size  800 in  10 sec =    46.875 kbyte/sec from 
65.174.250.11
Received  160 pps of size  800 in  10 sec =   125.000 kbyte/sec from 
65.174.250.12
Received  800 pps of size  800 in  10 sec =   625.000 kbyte/sec from 
65.174.250.13

Every 10 seconds.