I have a network that is setup for multicast traffic. My setup is the following
-Machine A : a server generates multicast traffic.
-Machine A : few clients subscribing to that multicast traffic
-Machine B : few clients subscribing to that multicast traffic
# Address I am using
IP : 239.193.0.21
PORT: 20401
The clients in machine A , even if they join the group (I can see IGMP messages through wireshark), don't receive any data while (and this is the funny part) machine B,C and D receive everything.
I sorted that issue by completely disabling Linux firewall.
Before doing that, I enabled the multicast on the firwall ('reject all').
iptables -A INPUT -m addrtype --src-type MULTICAST -j ACCEPT
My question is the following: what I can check in wireshark that can help me in spot such firewall issues in the futures? For TCP/IP
I realize by using ping
and looking at ICMP
packets rejected.
What I can check/monitor for multicast?
I am using LInux/Red-Hat Enterprise 6.2