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Supplyment multicast document with a limitation #4850

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Apr 18, 2023
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Supplyment multicast document with a limitation #4850

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8 changes: 8 additions & 0 deletions docs/multicast-guide.md
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ Antrea supports multicast traffic in the following scenarios:
- [Use case example](#use-case-example)
- [Limitations](#limitations)
- [Encap mode](#encap-mode)
- [Maximum number of receiver groups on one Node](#maximum-number-of-receiver-groups-on-one-node)
- [Traffic in local network control block](#traffic-in-local-network-control-block)
- [Linux kernel](#linux-kernel)
<!-- /toc -->
Expand Down Expand Up @@ -137,6 +138,13 @@ Support for Windows and IPv6 will be added in the future.
Configuration option `multicastInterfaces` is not supported with encap mode.
Multicast packets in encap mode are SNATed and forwarded to the transport interface only.

### Maximum number of receiver groups on one Node

A Linux host limits the maximum number of multicast groups it can subscribe to;
the default number is 20. The limit can be changed by setting [/proc/sys/net/ipv4/igmp_max_memberships](https://sysctl-explorer.net/net/ipv4/igmp_max_memberships/).
Users are responsible for changing the limit if Pods on the Node are expected to
join more than 20 groups.

### Traffic in local network control block

Multicast IPs in [Local Network Control Block](https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml#multicast-addresses-1) (224.0.0.0/24)
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