11 Oct
2020
11 Oct
'20
10:37 a.m.
Phil Karn via 44Net je 11. 10. 20 ob 14:37 napisal:
Seriously, this touches on one of my pet topics: IP
multicasting. A huge
amount of work went into the development of IP multicast protocols in
the 1980s and 1990s, yet nearly all of it has been stillborn. It sees
use only in walled gardens like AT&T Uverse (an IPTV over VDSL service
in the US) and in degenerate form for intra-net resource discovery on LANs.
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.
This is an idea behind a DMR-Multicast project which is already written
and I hope I will start testing to release this winter.
73, Janko S57NK
Most (if not nearly all) of the Internet's traffic is fundamentally
multicast in nature. Even this mailing list is a many-to-many
communication. I'm continually appalled by the willingness of commercial
services to simply throw money, computers and fiber at replicating and
sending unicast packets on a petabyte scale while ignoring the
technology and protocols invented to solve this exact problem in a
scalable and cost-effective way.
Clearly there's an opportunity here for any group motivated by the
desire to do it right. It's something I could certainly support within ARDC.
Phil