12 Oct
2020
12 Oct
'20
7:01 a.m.
Hi everyone,
I feel the urge on chiming in on this topic regarding multicast.
While multicast works on a flat network (e.g. 44.0.0.0/8, or our current
/9 + /10), there are some issues on this solution for 44net: the fact
that is is subnetted and edge routers will not pass this traffic unless
a PIM or a IGMP proxy is set up on each of them.
Now, while advanced routers are quite capable of doing it (e.g. Mikrotik
gear), I am not so sure about other devices used as gateways. And BGP
announced subnets are out of the question AFAIK, since there are actual
independent networks. But anyhow, there is a configuration effort be
done on each gateway or edge router.
Of course, experimenting would be nice, but I would not get my hopes up
high for a globally working multicast solution at this moment.
Marius, YO2LOJ
On 11.10.2020 20:31, Phil Karn via 44Net wrote:
On 10/11/20 07:36, Janko Mivšek via 44Net wrote:
I agree and IP Multicast is something we can
afford on our 44net based
networks, which are without NAT and other limits for IPv4 Multicast.
For connecting DMR repeaters between themselves directly, in zero-cong
fashion, for instance. Without need for a central DMR master server,
which itself is a single point of failure. Its sole role can be to
coordinate traffic on talkgroups but the repeater network can learn
and communicate directly afterwards. Specially in case of master
server failure or network split of any kind.
I am especially interested in
repeater linking via amateur IP
facilities. As I understand it, most repeater linking is over commercial
Internet connections, which is great except that you can't count on them
being there in emergencies. Besides, we're hams.
I don't know DMR's IP-level protocols, but if they can be multicast, and
the 44-net can support general multicast, that would be a perfect
combination.
This is an idea behind a DMR-Multicast project
which is already
written and I hope I will start testing to release this winter.
Great!
Phil
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