commits September 2024

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (cce9016f)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit cce9016fa62cd340b9ce40595a0570ac067f22e2 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:24:19 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- cce9016fa62cd340b9ce40595a0570ac067f22e2 batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index a79341f1..1b13114e 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -11,6 +11,8 @@ h2. Introduction Currently batman-adv forwards/floods an IGMP/MLD Report to all other nodes by default. The _multicast_mld_rtr_only_ option allows to change this behavior to only forward IGMP/MLD Reports to nodes with a multicast router, to reduce IGMP/MLD overhead in the mesh while still enabling layer 3 multicast routing. However this option is not always safe to use, so this page illustrates the scenarios where this option can and cannot be used. +tl;dr: Scenario C is the potentially unsafe scenario for a _multicast_mld_rtr_only_ option. + h3. Scenario A: Multicast to host on node without querier h4. Scenario A, Overview:

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (ca63f488)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit ca63f48879269fb240dfea354c0230f417cabfa1 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:24:29 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- ca63f48879269fb240dfea354c0230f417cabfa1 batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 1b13114e..3d6074e0 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -11,7 +11,7 @@ h2. Introduction Currently batman-adv forwards/floods an IGMP/MLD Report to all other nodes by default. The _multicast_mld_rtr_only_ option allows to change this behavior to only forward IGMP/MLD Reports to nodes with a multicast router, to reduce IGMP/MLD overhead in the mesh while still enabling layer 3 multicast routing. However this option is not always safe to use, so this page illustrates the scenarios where this option can and cannot be used. -tl;dr: Scenario C is the potentially unsafe scenario for a _multicast_mld_rtr_only_ option. +_tl;dr:_ Scenario C is the potentially unsafe scenario for a _multicast_mld_rtr_only_ option. h3. Scenario A: Multicast to host on node without querier

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (b30aa3a6)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit b30aa3a65893c5132388faa3ac05134eecd0b279 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:55:27 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- b30aa3a65893c5132388faa3ac05134eecd0b279 .../Multicast-IGMP-MLD-Report-Forwarding.textile | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index 3d6074e0..3ea88cec 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -129,7 +129,23 @@ Answer: yes **Learning:** -WIP +1) Bridged-in host A listens to a link-local multicast address <MC-LL-A> +2) Bridged-in host C on node Y floods an MLD Query through the mesh +2.1) Node Y sets and floods a WANT_ALL flag, because querier is potentially [[Multicast-optimizations-flags#Case-3-Shadowing-Multicast-Querier|"shadowing"]]. +2.2) Node X learns node Y's WANT_ALL flag. +3) Host A replies to the MLD query with an MLD Report for <MC-LL-A> +3.1) br0 on node X learns that a listener for <MC-LL-A> is behind eth0 and then forwards the MLD Report further towards the querier on bat0, as required by RFC4541 +3.2) batman-adv on node X learns about the listener for <MC-LL-A> through the export of the bridge and then adds it to TT, which gets distributed to other nodes. +3.3) batman-adv on node X will forward the MLD Report towards node Y, even with the multicast_rtr_only option enabled, as node Y has the WANT_ALL flag set. +3.4) batman-adv on node Y learns about <MC-LL-A> through the TT +3.5) br0 on node Y learns that a listener for <MC-LL-A> is behind bat0 and then forwards the MLD Report further towards the querier on eth0, as required by RFC4541 + +**Multicast packet forwarding:** + +4) Bridged-in host B sends a multicast packet to the multicast address <MC-LL-A> +4.1) br0 on node X has heard of <MC-LL-B> and will forward the multicast packet towards bat0, as required by RFC4541 +... +Packet arrives at bridged-in host A h3. Scenario E: Multicast to host on node with a bridged-in querier

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-D.png (af21a31d)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit af21a31dbf0486ce7716e820f0ce87fed02345fa Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:14:25 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-D.png >--------------------------------------------------------------- af21a31dbf0486ce7716e820f0ce87fed02345fa batman-adv/mld-to-mcast-routers-only-scenario-D.png | Bin 0 -> 82182 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-D.png b/batman-adv/mld-to-mcast-routers-only-scenario-D.png new file mode 100644 index 00000000..98a12d41 Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-D.png differ

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-D.dia (2e844666)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 2e84466631ad25be6284e46bc3a2fff973d9e522 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:14:25 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-D.dia >--------------------------------------------------------------- 2e84466631ad25be6284e46bc3a2fff973d9e522 batman-adv/mld-to-mcast-routers-only-scenario-D.dia | Bin 0 -> 3748 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-D.dia b/batman-adv/mld-to-mcast-routers-only-scenario-D.dia new file mode 100644 index 00000000..15e974cd Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-D.dia differ

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[doc] backup-redmine,main: doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding (a00abf88)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit a00abf889a8561d0955c5e4d5fda8dc669fe4739 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:21:15 2024 +0000 doc: batman-adv/Multicast-IGMP-MLD-Report-Forwarding >--------------------------------------------------------------- a00abf889a8561d0955c5e4d5fda8dc669fe4739 .../Multicast-IGMP-MLD-Report-Forwarding.textile | 30 +++++++++++++++++++--- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile index a785f36a..a79341f1 100644 --- a/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile +++ b/batman-adv/Multicast-IGMP-MLD-Report-Forwarding.textile @@ -112,14 +112,36 @@ C) Run a bridged-in multicast router (which supports MRD) on node Y (disadvantag D) Send report not just to multicast routers, but also to queriers (not implemented) E) Export batman-adv TT-global to bridge MDB (not implemented) -h3. Scenario D: Multicast to/from host on node with a bridged-in querier - -WIP +h3. Scenario D: Multicast from host on node with a bridged-in querier h4. Scenario D, Overview: -_Can bridged-in host A send multicast to bridged-in host B?_ +!mld-to-mcast-routers-only-scenario-D-overview.png! +_Can bridged-in host B send multicast to bridged-in host A?_ h4. Scenario D, Analysis: Answer: yes + +!mld-to-mcast-routers-only-scenario-D.png! + +**Learning:** + +WIP + +h3. Scenario E: Multicast to host on node with a bridged-in querier + +h4. Scenario E, Overview: + +!mld-to-mcast-routers-only-scenario-E-overview.png! +_Can bridged-in host B send multicast to bridged-in host A?_ + +h4. Scenario E, Analysis: + +Answer: yes + +!mld-to-mcast-routers-only-scenario-E.png! + +**Learning:** + +WIP \ No newline at end of file

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-E-overview.png (0a218f0d)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 0a218f0dec7e6c99c879c6ad6b9b36d9f78c25c6 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:14:24 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-E-overview.png >--------------------------------------------------------------- 0a218f0dec7e6c99c879c6ad6b9b36d9f78c25c6 .../mld-to-mcast-routers-only-scenario-E-overview.png | Bin 0 -> 44714 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-E-overview.png b/batman-adv/mld-to-mcast-routers-only-scenario-E-overview.png new file mode 100644 index 00000000..c2306bd5 Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-E-overview.png differ

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-E-overview.dia (b8029724)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit b80297244dcf4471080520fa6bcd866071ad300c Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:14:24 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-E-overview.dia >--------------------------------------------------------------- b80297244dcf4471080520fa6bcd866071ad300c .../mld-to-mcast-routers-only-scenario-E-overview.dia | Bin 0 -> 2408 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-E-overview.dia b/batman-adv/mld-to-mcast-routers-only-scenario-E-overview.dia new file mode 100644 index 00000000..9bfdfa23 Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-E-overview.dia differ

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-D-overview.dia (ec32493f)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit ec32493f413a1b677658de2f5d961b405ad84941 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:14:24 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-D-overview.dia >--------------------------------------------------------------- ec32493f413a1b677658de2f5d961b405ad84941 .../mld-to-mcast-routers-only-scenario-D-overview.dia | Bin 0 -> 2344 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-D-overview.dia b/batman-adv/mld-to-mcast-routers-only-scenario-D-overview.dia new file mode 100644 index 00000000..59ce99bb Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-D-overview.dia differ

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[doc] backup-redmine,main: doc: batman-adv/mld-to-mcast-routers-only-scenario-E.png (9be57a69)
by postmaster＠open-mesh.org 07 Sep '24

07 Sep '24

Repository : ssh://git@diktynna/doc On branches: backup-redmine,main >--------------------------------------------------------------- commit 9be57a69979828c1d70e135255909d569fb613e9 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Sat Aug 31 20:14:24 2024 +0000 doc: batman-adv/mld-to-mcast-routers-only-scenario-E.png >--------------------------------------------------------------- 9be57a69979828c1d70e135255909d569fb613e9 batman-adv/mld-to-mcast-routers-only-scenario-E.png | Bin 0 -> 80039 bytes 1 file changed, 0 insertions(+), 0 deletions(-) diff --git a/batman-adv/mld-to-mcast-routers-only-scenario-E.png b/batman-adv/mld-to-mcast-routers-only-scenario-E.png new file mode 100644 index 00000000..435b3dc5 Binary files /dev/null and b/batman-adv/mld-to-mcast-routers-only-scenario-E.png differ

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commits September 2024