Multicast 多播测试工具

Multicast Setup and Configuration

Multicast Troubleshooting Tools

• (used to receive multicast traffic from iperf traffic)
• (install ssmpingd and use asmping as client)
• (Hit or miss troubleshooting tool)
• (Webcam Multicast Application)
• (Diagnoses Multicast Group Connectivity)

Router Multicast Command References

Iperf Troubleshooting Commands

• Start a multicast iperf traffic stream (On computer A):

  iperf -u -c -p -b 1 -i 5 -T 10 -t 1000

• Capture with rtpqual or iperf (On computer B):

  rtpqual @
  iperf -s -i 1 -u -B -p

Creating a Real Multicast Stream with WebCam

• Use the following (on linux machine):

  vic /

• Select type of webcam in vic settings
• On the client machine use the same command to receive the multicast video

  vic /

• (vic is the same application used by the AccessGrid)

Using SSMping to Test Multicast

Installing SSMping

• Grab the latest tarball from
• Install it to your local pkgs directory tree, assuming the tarball is located in /local/dl

  mkdir /local/pkgs/ssmping
  cd /local/pkgs/ssmping
  tar -zxf /local/dl/ssmping-0.8.tar.gz
  mv ssmping-0.8 0.8
  ln -s 0.8 std
  cd std
  make

• Create some symbolic links to the executables, so anyone can run the commands

  ln -s /local/pkgs/ssmping/std/asmping /usr/local/bin/asmping
  ln -s /local/pkgs/ssmping/std/ssmping /usr/local/bin/ssmping
  ln -s /local/pkgs/ssmping/std/ssmpingd /usr/local/bin/ssmpingd

• Add the following to the iptables file in /etc/sysconfig/iptables
  1. Allow Connections to the SSMping daemon
     -A RH-Firewall-1-INPUT -p udp -m udp -s 155.101.0.0/19 --dport 4321 -j ACCEPT
     -A RH-Firewall-1-INPUT -p udp -m udp -s 155.101.0.0/19 --sport 4321 -j ACCEPT
• Restart your iptables

  service iptables restart

  Running SSMping
• In the following example SSMping has been installed on machines megamon and orko
• First start up the daemon on one machine (in this case megamon.chpc.utah.edu)

  ssmpingd &

• Next, send an asmping to megamon from orko with a dummy multicast group

  asmping 233.3.3.3 megamon.chpc.utah.edu

• The output you should expect is the following

  ssmping joined (S,G) = (155.101.3.110,233.3.3.234)
  pinging S from 155.101.16.36
  unicast from 155.101.3.110, seq=1 dist=1 time=1.108 ms
  unicast from 155.101.3.110, seq=2 dist=1 time=0.349 ms
  multicast from 155.101.3.110, seq=2 dist=1 time=0.800 ms
  unicast from 155.101.3.110, seq=3 dist=1 time=0.280 ms
  multicast from 155.101.3.110, seq=3 dist=1 time=0.430 ms

Installing the Beacon Software on Redhat/Fedora Linux

• First download the tarball (version 1.3) from
• Create the proper directory tree

  mkdir /local/src/beacon
  mkdir -p /local/pkgs/beacon/1.3

• Unpack the tarball (assuming it's in /local/dl)

  cd /local/src/beacon
  tar -zxf /local/dl/beacon-1.3.tar.gz
  mv beacon-1.3 1.3

• Install the perl module Time::HiRes

  perl -MCPAN -e shell

• At the cpan> prompt type

  install Time::HiRes

• After the install, quit cpan

  quit

• Create a user for the beacon process to use (other linux distro may require more - adding the group, etc)

  adduser beacon

• Edit the main beacon configuration file in
  • Add/Change the following in /local/src/beacon/1.3/src/beacon.conf

    CONTACTNAME =
    CONTACTINFO = @chpc.utah.edu
    CONTACTLOCATION = University of Utah

RUNASUSER = beacon

RUNASGROUP = beacon

#STOPME = 1

• Configure and make the package

  cd /local/src/beacon/1.3
  ./configure --prefix=/local/pkgs/beacon/1.3
  make
  make install

• Edit the beacon executable to include the proper location of the beacon perl module
  • Add the following to /local/pkgs/beacon/1.3/bin/beacon (in amongst similar "use lib" lines)
  • Keep in mind that this is an example (look in the /local/pkgs/beacon/1.3/lib directory for similar perl path to use)

    use lib "/local/pkgs/beacon/1.3/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi";

• Create a directory in /home/beacon for the process to use (otherwise PID file creation will fail)

  mkdir /home/beacon/outputfiles
  chown beacon.beacon /home/beacon/outputfiles

• Create a symbolic link for beacon

  ln -s /local/pkgs/beacon/1.3/bin/beacon /usr/local/bin/beacon

• Edit the /etc/hosts file to include an entry for your correct hostname
  • Something like the following

    127.0.0.1 localhost localhost.localdomain
    155.101.3.109 megatron megatron.chpc.utah.edu

• Edit your iptables to something similar as below
  1. Allow Mulicast Beacon to talk
     -A RH-Firewall-1-INPUT -p udp -m udp -s 0/0 -d 0/0 --dport 10002 -j ACCEPT
     -A RH-Firewall-1-INPUT -p udp -m udp -s 0/0 -d 0/0 --dport 10003 -j ACCEPT
     -A RH-Firewall-1-INPUT -p tcp -m tcp -s 0/0 -d 0/0 --dport 10004 --syn -j ACCEPT
• Restart your iptables

  service iptables restart

• Before starting, make sure you have a valid hostname that will resolve (also add to your /etc/hosts file)
• Test out the software by firing off the executable

  beacon &

• Go to the listed webpage () to verify that you're talking to the main server
• Create a startup script for beacon
  • Uncomment the background line in /local/pkgs/beacon/1.3/etc/beacon.conf
    1. Move the Beacon process to background processing automatically at startup?
       BACKGROUND = 1
• Create a script file named beacon in /etc/rc.d/init.d/ that includes the following

  #!/bin/sh
  #

  1. Start/stop/restart the multicast beacons
  2. Assume backgrounding has been enabled in configuration file
  3. chkconfig: 345 90 10
  4. description: Beacon Multicast daemon

BEACON_HOME=/home/beacon/outputfiles

beacon_start() {
cd $

Unknown macro: {BEACON_HOME}

&& /local/pkgs/beacon/1.3/bin/beacon
}

beacon_stop() {
cd $

Unknown macro: {BEACON_HOME}

&& kill -HUP `cat multicastbeacon.PID`
}

beacon_restart()

Unknown macro: { beacon_stop sleep 1 beacon_start }

case "$1" in
'start')
beacon_start
;;
'stop')
beacon_stop
;;
'restart')
beacon_restart
;;
*)
echo "usage $0 start|stop|restart"
esac

• Make the file world executable

  chmod a+x /etc/rc.d/init.d/beacon

• Add beacon to the chkconfig list

  chkconfig --level 345 beacon on

• Kill any existing beacon processes if necessary

  ps -eaf |grep beacon
  kill

• Then fire up beacon with the script

  service beacon start

参考: