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#multicast

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Brett Sheffield (he/him)<p>And yes, I have written a <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> git transport for <a href="https://chaos.social/tags/librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>librecast</span></a></p><p>Of course I have.</p>
Librecast<p>We've got some good news thanks to <span class="h-card" translate="no"><a href="https://social.nlnet.nl/@nlnet" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>nlnet</span></a></span> and <span class="h-card" translate="no"><a href="https://mastodon.xyz/@NGIZero" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>NGIZero</span></a></span> 🎉 </p><p>Librecast has been funded to do more awesome things with <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> </p><p>Watch this space.</p><p><a href="https://chaos.social/tags/ngi" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ngi</span></a> <a href="https://chaos.social/tags/librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>librecast</span></a> </p><p><a href="https://spectra.video/w/fyecXM9ULjsKDpUN3bMiid" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">spectra.video/w/fyecXM9ULjsKDp</span><span class="invisible">UN3bMiid</span></a></p>
just small circles 🕊<p><span class="h-card" translate="no"><a href="https://social.tchncs.de/@mray" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>mray</span></a></span> <span class="h-card" translate="no"><a href="https://social.coop/@cwebber" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>cwebber</span></a></span> would love to know as well.</p><p>For people not in the know, <span class="h-card" translate="no"><a href="https://chaos.social/@librecast" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>librecast</span></a></span> is a R&amp;D initiative that's innovating the internet stack with support of <span class="h-card" translate="no"><a href="https://mastodon.xyz/@NGIZero" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>NGIZero</span></a></span> and <span class="h-card" translate="no"><a href="https://social.nlnet.nl/@nlnet" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>nlnet</span></a></span> </p><p>First, to enable <a href="https://social.coop/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> on the unicast internet an overlay network is planned, based on <a href="https://social.coop/tags/WebRTC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WebRTC</span></a>. See:</p><p><a href="https://librecast.net/librecast-strategy-2025.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">librecast.net/librecast-strate</span><span class="invisible">gy-2025.html</span></a></p><p><a href="https://social.coop/tags/Librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Librecast</span></a> LIVE will bring all the technology together, to demonstrate and be a reference implementation. With <a href="https://social.coop/tags/ActivityPub" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ActivityPub</span></a> support being planned. See:</p><p><a href="https://librecast.net/live.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">librecast.net/live.html</span><span class="invisible"></span></a></p>
just small circles 🕊<p>Dodge the dodgy <a href="https://social.coop/tags/AI" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>AI</span></a> infested corporate <a href="https://social.coop/tags/streaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>streaming</span></a> services and zoom out, as on the <a href="https://social.coop/tags/fediverse" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fediverse</span></a> we own the stream. Here are platforms that offer <a href="https://social.coop/tags/streaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>streaming</span></a> of <a href="https://social.coop/tags/video" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>video</span></a> or <a href="https://social.coop/tags/audio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>audio</span></a> in real time or near real time, with live chat and other <a href="https://social.coop/tags/social" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>social</span></a> capabilities.</p><p>On the fediverse our 💜 <a href="https://social.coop/tags/lifestreams" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>lifestreams</span></a> meet people and humanity and we engage our favorite fedi crowds. Fedi is where outreach matters.</p><p><a href="https://social.coop/tags/Librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Librecast</span></a> LIVE. <span class="h-card" translate="no"><a href="https://chaos.social/@librecast" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>librecast</span></a></span> is a research project aiming to bring <a href="https://social.coop/tags/Multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Multicast</span></a> to the masses.</p><p><a href="https://social.coop/tags/Owncast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Owncast</span></a>. <span class="h-card" translate="no"><a href="https://social.owncast.online/@owncast" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>owncast</span></a></span></p>
Brett Sheffield (he/him)<p>Had an interesting conversation with someone from the IETF about <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> today.</p><p>Some folks have been trying to solve the problem of getting multicast streams from unicast only sources (Off-net Sourcing) such as browsers.</p><p>This happens to be something <a href="https://chaos.social/tags/Librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Librecast</span></a> built a demo for back in 2022 as part of <a href="https://chaos.social/tags/NGI0Discovery" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NGI0Discovery</span></a> and which we're working on again now as part of <a href="https://chaos.social/tags/NGI0Core" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NGI0Core</span></a> thanks to <span class="h-card" translate="no"><a href="https://social.nlnet.nl/@nlnet" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>nlnet</span></a></span> so I think we might be able to help.</p>
just small circles 🕊<p><span class="h-card" translate="no"><a href="https://chaos.social/@librecast" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>librecast</span></a></span> <span class="h-card" translate="no"><a href="https://mastodon.xyz/@NGIZero" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>NGIZero</span></a></span> </p><p>Congratulations on the release, <a href="https://social.coop/tags/Librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Librecast</span></a> team! 🎉</p><p>It is a very exciting <a href="https://social.coop/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> use case you are driving lcagent with, and I am looking forward to learn more about your experiences with this <a href="https://social.coop/tags/CI" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CI</span></a> setup.</p><p>Thank you, for all the hard work!</p>
Librecast<p>lcagent can be used to send and receive data over <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> and to pipe data between programs on one computer and as many receivers as the multicast network can support simultaneously. We're currently using it now to run our own CI builds by multicasting the patch to multiple build servers simultaneously. </p><p>This could also be useful for monitoring and configuration management.<br><a href="https://chaos.social/tags/librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>librecast</span></a></p><p><a href="https://codeberg.org/librecast/lcagent" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">codeberg.org/librecast/lcagent</span><span class="invisible"></span></a></p><p>This work is made possible by <span class="h-card" translate="no"><a href="https://mastodon.xyz/@NGIZero" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>NGIZero</span></a></span> <a href="https://chaos.social/tags/NGICore" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NGICore</span></a></p>
Librecast<p>We've got a new tool! lcagent version 0.1.0, the <a href="https://chaos.social/tags/Librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Librecast</span></a> <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> agent.</p><p>In server mode, lcagent can be configured to listen on Librecast Channels (multicast groups) and execute programs in response to packet data received on those Channels.</p><p>Packets must be accompanied by an authorized token and signed by the matching key or they will be silently dropped.</p><p>Data is encoded with <a href="https://chaos.social/tags/RaptorQ" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RaptorQ</span></a> using Librecast’s liblcrq library to provide forward error correction in the event of packet loss.</p>
Olivier Auber<p>Je trie mes vieux cartons : <br><a href="https://aleph.land/tags/collector" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>collector</span></a> ! Il y a trente ans, Francis Mizio raconte comment il été pris d'une sorte de frayeur cosmique lors de la première expérience planètaire temps réel de la version distribuée <a href="https://aleph.land/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> du <a href="https://aleph.land/tags/poieticgenerator" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>poieticgenerator</span></a></p>
Brett Sheffield (he/him)<p><span class="h-card" translate="no"><a href="https://mastodon.sdf.org/@dlakelan" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>dlakelan</span></a></span> <span class="h-card" translate="no"><a href="https://social.tchncs.de/@mray" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>mray</span></a></span> You're technically correct (the best kind!)</p><p>Yes, SSM is PULL rather than PUSH, so it has one of the properties of multicast, but it is lacking the other characteristics that make multicast special.</p><p>SSM relies on knowing in advance the *unicast* IP address of the source.</p><p>SSM is unidirectional.</p><p>SSM lets one sender shout at everyone else.</p><p>SSM is not group communication.</p><p>SSM has its uses, and it's easier than true <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> but it doesn't meet <a href="https://chaos.social/tags/Librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Librecast</span></a> 's requirements.</p>
Brett Sheffield (he/him)<p><span class="h-card" translate="no"><a href="https://social.tchncs.de/@mray" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>mray</span></a></span> IP multicast is a complicated mess, largely because IP is fundamentally unicast in design. There are several different forms of ASM (Any Source Multicast) and most of the complexity is around building source trees when you don't know where the source(s) will be yet.</p><p>SSM is a clever hack that says, what if we just skip past all that to the end when we KNOW who is sending, and build that, as it covers a lot of use cases (eg. ballgames).</p><p>But, it loses most of what makes <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> special</p>
Brett Sheffield (he/him)<p><span class="h-card" translate="no"><a href="https://social.tchncs.de/@mray" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>mray</span></a></span> Depends on your point of view. Streaming a ballgame to millions of viewers is a problem television solved over 70 years ago. We call that broadcast.</p><p>If we use SSM (Single Source Multicast) to unidirectionally stream a game to millions of viewers, I call that broadcast, regardless of how many protocols we use that happen to have <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> in their name.</p><p>Most IP multicast is actually broadcast.</p><p>Multicast is group communication. If only one member of the group can speak, that's broadcast.</p>
Brett Sheffield (he/him)<p>Oops. I think I might have just told a well known person in the IP <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> world that SSM isn't multicast and that what they've built is "broadcast"...</p>
T_X<p>Oh, ha, and speaking of <a href="https://chaos.social/tags/firewall" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>firewall</span></a> + <a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> fixes: Didn't notice before but my <a href="https://chaos.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> <a href="https://chaos.social/tags/netfilter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>netfilter</span></a> fix for <a href="https://chaos.social/tags/MRD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MRD</span></a> has made it upstream, yaiy: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4a3540a8bf3c13dc3955f0c0895332b9c653be3f" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">git.kernel.org/pub/scm/linux/k</span><span class="invisible">ernel/git/torvalds/linux.git/commit/?id=4a3540a8bf3c13dc3955f0c0895332b9c653be3f</span></a><br>It went in through net-next, so likely won't be backported to stable kernels. But now I'm looking forward to <a href="https://chaos.social/tags/Proxmox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proxmox</span></a> using Linux 6.10, then I can drop the workaround firewall rule on the <span class="h-card" translate="no"><a href="https://social.chaotikum.org/@chaotikumev" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>chaotikumev</span></a></span> server.</p>
Librecast<p>It's a new release of Librecast! 🎉</p><p>This release adds restricted channel support with token based authentication. This allows keyrings to be created and filters to be applied to channels such that any data arriving which is not signed and accompanied by a token issued by an authorised key will be dropped.</p><p>This work is made possible by <span class="h-card" translate="no"><a href="https://mastodon.xyz/@NGIZero" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>NGIZero</span></a></span> as <a href="https://chaos.social/tags/NGICore" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NGICore</span></a> </p><p><a href="https://lists.sr.ht/~librecast/librecast-announce/%3Cf47f0cae-8d06-48bc-b073-6559fdaf894d@librecast.net%3E" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">lists.sr.ht/~librecast/libreca</span><span class="invisible">st-announce/%3Cf47f0cae-8d06-48bc-b073-6559fdaf894d@librecast.net%3E</span></a></p><p><a href="https://chaos.social/tags/multicast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multicast</span></a> <a href="https://chaos.social/tags/librecast" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>librecast</span></a></p>
Marcel Waldvogel

All you never wanted to know about creating fast socket I/O on #Linux. Unless you are a real geek.

A small, ultra-high performance publish-subscribe server doing kind of TCP #multicast using #sendfile, #io_uring, #splice, (mapped) files, and #fallocate for file hole punching.

Saturating a 10 Gbps link with useful data with just 8 cores.

A beautiful writeup for anyone into fast Linux networking. Not just for #ATproto

h/t @nohillside
#PubSub #Kernel #Hacking
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