IoT Updates with IPv6 Multicast Brett Sheffield, Librecast Project - - PowerPoint PPT Presentation

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IoT Updates with IPv6 Multicast Brett Sheffield, Librecast Project - - PowerPoint PPT Presentation

Nov 23, 2022 260 likes •1.23k views

IoT Updates with IPv6 Multicast Brett Sheffield, Librecast Project @brett sheffield #FOSDEM2020 Before we begin... Multicast IP Multicast will play a prominent role on the Internet in the coming years. It is a requirement, not an option,

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IoT Updates with IPv6 Multicast

Brett Sheffield, Librecast Project @brett sheffield #FOSDEM2020

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Before we begin...

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Multicast

”IP Multicast will play a prominent role on the Internet in the coming years. It is a requirement, not an option, if the Internet is going to scale. Multicast allows application developers to add more functionality without significantly impacting the network.” – RFC 3170, Sep 2001

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Multicast

Efficient

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Multicast

Scalable

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Multicast

Real-World

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Multicast

Privacy

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Multicast

Decentralisation

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What is Multicast?

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Definition

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Definition

Unicast

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Definition

Unicast Broadcast

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Definition

Unicast Broadcast Multicast

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Definition

Unicast Broadcast Multicast

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What is Multicast?

Unicast, Broadcast Multicast

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What is Multicast?

Unicast, Broadcast PUSH Multicast

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What is Multicast?

Unicast, Broadcast PUSH Multicast PULL

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Multicast Misconceptions

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Multicast Misconceptions

◮ only for streaming

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Multicast Misconceptions

◮ only for streaming ◮ no use for video on demand

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Multicast Misconceptions

◮ only for streaming ◮ no use for video on demand ◮ unreliable

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Multicast Misconceptions

◮ only for streaming ◮ no use for video on demand ◮ unreliable ◮ insecure

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Multicast Misconceptions

◮ only for streaming ◮ no use for video on demand ◮ unreliable ◮ insecure ◮ can’t work on Internet

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Multicast Misconceptions

◮ only for streaming ◮ no use for video on demand ◮ unreliable ◮ insecure ◮ can’t work on Internet

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Multicast is ...

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Multicast is ... Group Communication

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All Communication is Group Communication

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IoT Updates

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https://github.com/librestack/iotupd

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Datagram:

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Datagram:

◮ checksum

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Datagram:

◮ checksum ◮ size of file

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Datagram:

◮ checksum ◮ size of file ◮ size of chunk

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Datagram:

◮ checksum ◮ size of file ◮ size of chunk ◮ offset

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Datagram:

◮ checksum ◮ size of file ◮ size of chunk ◮ offset ◮ data

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What Just Happened?

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TCP/IP

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Are there other ways we can achieve TCP/IP-like reliability?

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PGM (RFC 3208 - Experimental)

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NACKs, Replay

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Loop and Repeat

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FEC

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Flow Control

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Flow Control

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Flow Control

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Flow Control

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Flow Control

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Flow Control

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Flow Control

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Flow Control

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Reliability

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Reliability

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DNS

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Anatomy of an IPv6 Multicast Address

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Anatomy of an IPv6 Multicast Address

ff

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Anatomy of an IPv6 Multicast Address

ff1

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Anatomy of an IPv6 Multicast Address

ff1e

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Anatomy of an IPv6 Multicast Address

ff1e: + group address (112 bits)

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Multicast ”DNS”

ff1e: + HASH(”example.com”)

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Multicast ”DNS”

example.com = ⇒ ff1e:873e:378f:f6a5:a1f6:fa49:95f1:0faf

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Librecast

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Librecast

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Librecast

◮ Developers Developers Developers

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Librecast

◮ Developers Developers Developers ◮ Messaging Library

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Librecast

◮ Developers Developers Developers ◮ Messaging Library ◮ Transitional Technology

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Librecast

◮ Developers Developers Developers ◮ Messaging Library ◮ Transitional Technology ◮ Improved Routing Protocol

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Librecast

◮ Developers Developers Developers ◮ Messaging Library ◮ Transitional Technology ◮ Improved Routing Protocol ◮ Build multicast-enabled applications

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Librecast

◮ Developers Developers Developers ◮ Messaging Library ◮ Transitional Technology ◮ Improved Routing Protocol ◮ Build multicast-enabled applications ◮ Work with FOSS projects to enable multicast everywhere

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Librecast

◮ Developers Developers Developers ◮ Messaging Library ◮ Transitional Technology ◮ Improved Routing Protocol ◮ Build multicast-enabled applications ◮ Work with FOSS projects to enable multicast everywhere ◮ Ensure new standards (eg. WebRTC, QUIC) support multicast

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l c c t x t ∗ ctx ; l c s o c k e t t ∗ sock ; l c c h a n n e l t ∗chan ; l c m e s s a g e t msg ; ctx = l c c t x n e w ( ) ; sock = l c s o c k e t n e w ( ctx ) ; chan = lc channel new ( ctx , channelName ) ; l c c h a n n e l b i n d ( sock , chan ) ; l c m s g i n i t s i z e (&msg , s t r l e n ( msgtext ) − 1 ) ; lc msg send ( chan , &msg ) ; /∗ clean up ∗/ l c s o c k e t c l o s e ( sock ) ; l c c h a n n e l f r e e ( chan ) ; l c c t x f r e e ( ctx ) ;

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Brett Sheffield — Librecast Project

http://brettsheffield.com — Email: brett@librecast.net Freenode: bacs — Twitter: @brett sheffield github.com/brettsheffield — github.com/librestack