DEBUG HINTS

  - Check the source is issuing multicast packets with TTL high enough
    to reach the recipients.

  - Check the multicast packets are not being dropped due to
    fragmentation problems.

  - Three easy options to test IGMPv3 joins from the receiver host:

    1) Configure pimd on the receiver host with "ip igmp join":

       interface eth0
        ip pim ssm
        ip igmp join 239.1.1.1 1.1.1.1 

    2) Use test_igmpv3_join command-line utility (provided with qpimd):

       test_igmpv3_join eth0 239.1.1.1 1.1.1.1

    3) User the Stig Venaas' ssmping utility:

       ssmping -I eth0 1.1.1.1

       To see multicast responses with ssmping, you will need run on
       the host 1.1.1.1 either:
       a) Stig Venaas' ssmpingd command-line daemon
          OR
       b) qpimd built-in ssmpingd service:
          conf t
            ip ssmpingd 1.1.1.1

  - Using nepim to generate multicast stream from 1.1.1.1 to 239.1.1.1:

    Notices:

    a) The host unicast address 1.1.1.1 must be reachable from the
    receiver.

    b) nepim tool requires the receiver must be started *before* the
    sender.

    First: Start a receiver for that stream by running:

    nepim -q -6 -j 1.1.1.1+239.1.1.1@eth0
    (Remember of enabling both "ip pim ssm" and "ip igmp" under eth0.)

    Second: Start the sender at host 1.1.1.1.

    The following command generates a 100-kbps multicast stream for
    channel 1.1.1.1,239.1.1.1 with TTL 10 and 1000-byte payload per UDP
    packet (to avoid fragmentation):

    nepim -6 -M -b 1.1.1.1 -c 239.1.1.1 -T 10 -W 1000 -r 100k -a 1d



SAMPLE DEBUG COMMANDS

  conf t
   int eth0
    ip pim ssm

  test pim receive hello eth0 192.168.0.2 600 10 111 1000 3000 0
  test pim receive join eth0 600 192.168.0.1 192.168.0.2 239.1.1.1 1.1.1.1

  show ip pim join                                                         


INTEROPERABILITY WITH CISCO

  ! Cisco IP Multicast command reference:
  ! ftp://ftpeng.cisco.com/ipmulticast/Multicast-Commands
  !
  ip pim ssm default ! enable SSM mode for groups 232.0.0.0/8
  ip multicast-routing
  ip pim state-refresh disable
  no ip pim dm-fallback
  !
  interface FastEthernet0
   ip pim sparse-mode
   ip igmp version 3

-x-
