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docs: Add v2021.1 release notes #2230

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merged 2 commits into from
Jun 10, 2021
Merged

docs: Add v2021.1 release notes #2230

merged 2 commits into from
Jun 10, 2021

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mweinelt
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@mweinelt mweinelt commented Jun 8, 2021

release-notes for v2021.1

related to #2107

@mweinelt mweinelt added the 9. meta: release notes Significant change that should be mentioned in the release notes label Jun 8, 2021
@mweinelt mweinelt force-pushed the release-notes/v2021.1 branch 3 times, most recently from 149d8e7 to d5e307c Compare June 8, 2021 20:10
@github-actions github-actions bot added the 3. topic: docs Topic: Documentation label Jun 8, 2021
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mweinelt commented Jun 9, 2021

Thanks everyone, that was some great feedback!

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@rotanid rotanid added this to the 2021.1 milestone Jun 10, 2021
@rotanid rotanid mentioned this pull request Jun 10, 2021
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@mweinelt mweinelt force-pushed the release-notes/v2021.1 branch 2 times, most recently from 40f1674 to 46cff8f Compare June 10, 2021 20:36
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@mweinelt mweinelt merged commit 206e0fe into master Jun 10, 2021
@mweinelt mweinelt deleted the release-notes/v2021.1 branch June 10, 2021 21:41
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Multicast optimizations (batman-adv)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In this release, we reenable the multicast optimizations, that have gone through another round of bug squashing upstream. This reduces layer 2 overhead, especially for IPv6 neighbor discovery, because multicast traffic will be converted to unicast traffic when the number of subscribers does not exceed 16. This is beneficial as we would previously drop multicast traffic that wasn't explicitly allowed but now can allow multicast traffic if it wouldn't result in broadcast.
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Suggested change
In this release, we reenable the multicast optimizations, that have gone through another round of bug squashing upstream. This reduces layer 2 overhead, especially for IPv6 neighbor discovery, because multicast traffic will be converted to unicast traffic when the number of subscribers does not exceed 16. This is beneficial as we would previously drop multicast traffic that wasn't explicitly allowed but now can allow multicast traffic if it wouldn't result in broadcast.
In this release, we reenable the multicast optimizations that have gone through another round of bug squashing upstream. With this feature batman-adv will distribute IPv6 link-local multicast packets via individual unicast packets instead of flooding them through the whole mesh as long as the number of subscribed nodes does not exceed 16. This reduces layer 2 overhead, especially for IPv6 Neighbor Discovery.
We also relaxed the firewall for IPv6 multicast packets: Instead of always dropping non-essential multicast packets we now allow all IPv6 link-local multicast packets to pass which only hosts on up to 16 nodes signed up for.

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