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[doc] backup-redmine,main: doc: batman-adv/Multicast.png (44bee666)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 44bee6669c957402beaed5533a87709ef70dafd6 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:42:30 2024 +0000 doc: batman-adv/Multicast.png >--------------------------------------------------------------- 44bee6669c957402beaed5533a87709ef70dafd6 batman-adv/Multicast.png | Bin 0 -> 58808 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/Multicast.png b/batman-adv/Multicast.png new file mode 100644 index 00000000..c8de0290 Binary files /dev/null and b/batman-adv/Multicast.png differ

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[doc] backup-redmine,main: doc: batman-adv/Multicast-optimizations (1f1386ca)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 1f1386ca66d7f8bfbd0253bcf3c2a6180c368b39 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:44:12 2024 +0000 doc: batman-adv/Multicast-optimizations >--------------------------------------------------------------- 1f1386ca66d7f8bfbd0253bcf3c2a6180c368b39 batman-adv/Multicast-optimizations.textile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/batman-adv/Multicast-optimizations.textile b/batman-adv/Multicast-optimizations.textile index 65551eb1..c1c8ba2c 100644 --- a/batman-adv/Multicast-optimizations.textile +++ b/batman-adv/Multicast-optimizations.textile @@ -1,5 +1,7 @@ h1. Multicast Optimizations +!{width:33%;}Multicast.png! + "Multicast":https://en.wikipedia.org/wiki/Multicast allows to transmit data to a group of receivers, unlike unicast which transmits to just one receiver and broadcast which transmits to everyone. Multicast is used for applications like IPTV, internet radio or group communication and more. Also IPv6 relies on multicast for its basic services. Without optimization, switches (including batman-adv) typically implement multicast as broadcast. If everyone gets the packet, all group members get it too. Consequently, all layer 2 switches are multicast capable, but that comes with a cost: Even if there are only a few multicast listeners interested, the whole mesh network is unnecessarily bothered with these multicast packets. Considering that broadcast transmissions are particularly expensive operations on WiFi in general and wireless mesh networks (in terms of bandwidth) reducing the amount of multicast traffic by only forwarding traffic to its multicast group members will greatly improve performance for these services.

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[doc] backup-redmine,main: doc: batman-adv/Multicast-optimizations-tech (72368084)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 72368084d4babb1bfd5ee0033f4e65a343b017ea Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:52:57 2024 +0000 doc: batman-adv/Multicast-optimizations-tech >--------------------------------------------------------------- 72368084d4babb1bfd5ee0033f4e65a343b017ea batman-adv/Multicast-optimizations-tech.textile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/batman-adv/Multicast-optimizations-tech.textile b/batman-adv/Multicast-optimizations-tech.textile index 98e95e73..b200e6af 100644 --- a/batman-adv/Multicast-optimizations-tech.textile +++ b/batman-adv/Multicast-optimizations-tech.textile @@ -68,8 +68,10 @@ Optimization for IPv4 or IPv6 multicast packets is performed by considering a fe If the total number of nodes interested in a group is: * ... 0, then this frame can be safely dropped. -* ... 1, then this frame is encapsulated in and forwarded via a batman-adv unicast packet to the according destination. -* > 1, then this frame is encapsulated in a batman-adv broadcast packet and forwarded via classic flooding to all nodes. +* >= 1, then this frame is, in this order of priority, either: +** encapsulated in and forwarded via a [[Multicast-Packet-Type|batman-adv multicast packet]] to the according destination(s). +** encapsulated in and forwarded via batman-adv unicast packet(s) to the according destination(s). +** encapsulated in a [[Broadcast|batman-adv broadcast packet]] and forwarded via classic flooding to all nodes. The latter case is the general fallback to broadcast, which is also used when the the multicast optimization is turned off.

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[doc] backup-redmine,main: doc: batman-adv/Multicast-optimizations-tech (5fe9a6c8)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 5fe9a6c83700cb50e3d78375d41babdc7c65d281 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:57:41 2024 +0000 doc: batman-adv/Multicast-optimizations-tech >--------------------------------------------------------------- 5fe9a6c83700cb50e3d78375d41babdc7c65d281 batman-adv/Multicast-optimizations-tech.textile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/batman-adv/Multicast-optimizations-tech.textile b/batman-adv/Multicast-optimizations-tech.textile index b200e6af..fa820de2 100644 --- a/batman-adv/Multicast-optimizations-tech.textile +++ b/batman-adv/Multicast-optimizations-tech.textile @@ -65,6 +65,8 @@ h2. Multicast Sender Optimization for IPv4 or IPv6 multicast packets is performed by considering a few special cases. First, the number of nodes interested in a group is counted. Interest has been announced by either including the multicast group in TT entries, or setting the BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flags or the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag in case of unsnoopable ranges in the Multicast TVLV flag. +For routable IP multicast destinations the amount of multicast routers, signaled via the absence of either the BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flags, is further included in the count (see below for details). + If the total number of nodes interested in a group is: * ... 0, then this frame can be safely dropped.

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[doc] backup-redmine,main: doc: batman-adv/Multicast-optimizations-tech (d7ab84de)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit d7ab84de2343d64025936bc8ad80c0961c2819c5 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 03:00:02 2024 +0000 doc: batman-adv/Multicast-optimizations-tech >--------------------------------------------------------------- d7ab84de2343d64025936bc8ad80c0961c2819c5 batman-adv/Multicast-optimizations-tech.textile | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/batman-adv/Multicast-optimizations-tech.textile b/batman-adv/Multicast-optimizations-tech.textile index fa820de2..667234dc 100644 --- a/batman-adv/Multicast-optimizations-tech.textile +++ b/batman-adv/Multicast-optimizations-tech.textile @@ -70,10 +70,10 @@ For routable IP multicast destinations the amount of multicast routers, signaled If the total number of nodes interested in a group is: * ... 0, then this frame can be safely dropped. -* >= 1, then this frame is, in this order of priority, either: -** encapsulated in and forwarded via a [[Multicast-Packet-Type|batman-adv multicast packet]] to the according destination(s). -** encapsulated in and forwarded via batman-adv unicast packet(s) to the according destination(s). -** encapsulated in a [[Broadcast|batman-adv broadcast packet]] and forwarded via classic flooding to all nodes. +* >= 1, then this frame is encapsulated in and forwarded, in this order of priority, either via: +** a [[Multicast-Packet-Type|batman-adv multicast packet]] to the according destination(s). +** batman-adv unicast packet(s) to the according destination(s). +** [[Broadcast|batman-adv broadcast packet]] and forwarded via classic flooding to all nodes. The latter case is the general fallback to broadcast, which is also used when the the multicast optimization is turned off.

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[doc] backup-redmine,main: doc: batman-adv/Multicast-Packet-Type (041d199f)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 041d199f2875bc37947a33e5371b4aa2e73fc61d Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:34:30 2024 +0000 doc: batman-adv/Multicast-Packet-Type >--------------------------------------------------------------- 041d199f2875bc37947a33e5371b4aa2e73fc61d batman-adv/Multicast-Packet-Type.textile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/batman-adv/Multicast-Packet-Type.textile b/batman-adv/Multicast-Packet-Type.textile index 28ab7839..20488c6f 100644 --- a/batman-adv/Multicast-Packet-Type.textile +++ b/batman-adv/Multicast-Packet-Type.textile @@ -1,5 +1,10 @@ h1. Multicast Packet Type +Prior Readings: + +* [[multicast-optimizations|Multicast Optimizations]] +* [[multicast-optimizations-tech|Multicast Optimizations – Technical Description]] + Available since: "v2024.0":https://www.open-mesh.org/news/115. h2. Brief

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[doc] backup-redmine,main: doc: batman-adv/Multicast-Packet-Type (39909242)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 39909242eac08094887b6f5aecc6404fca9ff15f Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:35:35 2024 +0000 doc: batman-adv/Multicast-Packet-Type >--------------------------------------------------------------- 39909242eac08094887b6f5aecc6404fca9ff15f batman-adv/Multicast-Packet-Type.textile | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/batman-adv/Multicast-Packet-Type.textile b/batman-adv/Multicast-Packet-Type.textile index 20488c6f..0dd2b2eb 100644 --- a/batman-adv/Multicast-Packet-Type.textile +++ b/batman-adv/Multicast-Packet-Type.textile @@ -11,15 +11,15 @@ h2. Brief Reduce number of packets / overhead by introducing a new batman-adv multicast packet type which is capable of holding multiple destination addresses. -h2. Current State +h2. Previous State batman-adv now has IP multicast group awareness. And with that can detect in advance which other nodes want to receive an IPv4/IPv6 multicast packet for a specific multicast destination/multicast group. -The sender algorithm so far is simply either sending a packet via one batman-adv unicast packet for each interested destination node: +Before the sender algorithm so far was simply either sending a packet via one batman-adv unicast packet for each interested destination node: !{width: 66%;}https://www.open-mesh.org/attachments/download/888/basic-multicast-mul…! -Or when the number of destination is larger than 16 (default, configurable) it will fall back to using a single batman-adv broadcast packet: +Or when the number of destination is larger than 16 (default, configurable) it would fall back to using a single batman-adv broadcast packet: !{width: 66%;}https://www.open-mesh.org/attachments/download/890/basic-multicast-man…!

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[doc] backup-redmine,main: doc: batman-adv/Multicast-Packet-Type (5ce9bafb)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 5ce9bafbbd91fbc4b272c83961c1e71ff7f84d50 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:35:50 2024 +0000 doc: batman-adv/Multicast-Packet-Type >--------------------------------------------------------------- 5ce9bafbbd91fbc4b272c83961c1e71ff7f84d50 batman-adv/Multicast-Packet-Type.textile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/batman-adv/Multicast-Packet-Type.textile b/batman-adv/Multicast-Packet-Type.textile index 0dd2b2eb..8ac5131d 100644 --- a/batman-adv/Multicast-Packet-Type.textile +++ b/batman-adv/Multicast-Packet-Type.textile @@ -15,7 +15,7 @@ h2. Previous State batman-adv now has IP multicast group awareness. And with that can detect in advance which other nodes want to receive an IPv4/IPv6 multicast packet for a specific multicast destination/multicast group. -Before the sender algorithm so far was simply either sending a packet via one batman-adv unicast packet for each interested destination node: +Before, the sender algorithm so far was simply either sending a packet via one batman-adv unicast packet for each interested destination node: !{width: 66%;}https://www.open-mesh.org/attachments/download/888/basic-multicast-mul…!

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[doc] backup-redmine,main: doc: batman-adv/Multicast-Packet-Type (2bbb8368)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 2bbb8368e9dfb30d9efa28213c503f1996046a0b Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:37:17 2024 +0000 doc: batman-adv/Multicast-Packet-Type >--------------------------------------------------------------- 2bbb8368e9dfb30d9efa28213c503f1996046a0b

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[doc] backup-redmine,main: doc: batman-adv/Multicast-optimizations (ea430db4)
by postmaster＠open-mesh.org 10 May '24

10 May '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit ea430db48c80a52fee752e56531439a433c68d5a Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Fri Apr 19 02:39:39 2024 +0000 doc: batman-adv/Multicast-optimizations >--------------------------------------------------------------- ea430db48c80a52fee752e56531439a433c68d5a batman-adv/Multicast-optimizations.textile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/batman-adv/Multicast-optimizations.textile b/batman-adv/Multicast-optimizations.textile index 8e3394da..65551eb1 100644 --- a/batman-adv/Multicast-optimizations.textile +++ b/batman-adv/Multicast-optimizations.textile @@ -1,6 +1,6 @@ h1. Multicast Optimizations -Multicast allows to transmit data to a group of receivers, unlike unicast which transmits to just one receiver and broadcast which transmits to everyone. Multicast is used for applications like IPTV, internet radio or group communication and more. Also IPv6 relies on multicast for its basic services. +"Multicast":https://en.wikipedia.org/wiki/Multicast allows to transmit data to a group of receivers, unlike unicast which transmits to just one receiver and broadcast which transmits to everyone. Multicast is used for applications like IPTV, internet radio or group communication and more. Also IPv6 relies on multicast for its basic services. Without optimization, switches (including batman-adv) typically implement multicast as broadcast. If everyone gets the packet, all group members get it too. Consequently, all layer 2 switches are multicast capable, but that comes with a cost: Even if there are only a few multicast listeners interested, the whole mesh network is unnecessarily bothered with these multicast packets. Considering that broadcast transmissions are particularly expensive operations on WiFi in general and wireless mesh networks (in terms of bandwidth) reducing the amount of multicast traffic by only forwarding traffic to its multicast group members will greatly improve performance for these services.

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