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# $QuaggaId: $Format:%an, %ai, %h$ $
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-
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