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Forum Discussion
Netgear M4100-50G Multicast Configuration
Really hoping someone out there can help us with this: We have a client running two M4100-50G Switches (Firmware 10.0.2.20) interconnected with LAG. They are using an application which requir...
izools wrote:
They are using an application which requires Multicast to operate between machines on the local network.
Extremely unspecific 8-/
By far not every Multicast does make use of the Multicast Registration IGMP (for IPv4) or MLD (for IPv6).
What Multicast address (in IPv4 and in MAC) is used by this application in question?
Have seen several projects not using legal addresses for the intended purpose - switches can filter these silently for example.
FMI: https://www.iana.org/assignments/multicast-addresses/multicast-addresses.txt
OK so I've been able to glean the following information, but I don't see any traffic at all in Wireshark associated with a 237.x.x.x address on the machine hosting this application
"The following IP addresses should be white-listed on any network-based firewalls, and/or locally installed Firewall applications running on end terminals:
- 237.215.5:443
- 237.215.9:443
- 237.215.15:443
- 237.215.16:443"
So far no information on whether they're using IGMP or another protocol 🤔
Strange addresses 8-)
Taking the same assumption as yours, they might talk of 237.x.x.x. (237.x.x/24)
RFC5771 says on p.2/3
3. Definition of Current Assignment Practice
...
235.0.0.0 to 238.255.255.255 Reserved
...and continues on p.7...
13. Use of IANA Reserved Addresses
Applications MUST NOT use addressing in the IANA reserved blocks.
This explains in my reading why any kind if intelligent switches don't have to deak with these invalid addresses.
Yup, I noticed that too as soon as I found documentation confirming the address range this app uses.
Thank you for your help everyone, it seems this will be down to the software vendor's developers to look at.
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