Hi, openvswitch-2.5.0 seems to ignore IGMP queries with source IP 0.0.0.0
But, RFC seems to say the following: Highlighted in red.
That switches shouldn't drop queries with source IP 0.0.0.0.
RFC 4541 IGMP and MLD Snooping Switches Considerations May 2006
This is not a problem in an IGMPv3-only network because there is
no suppression of IGMP Membership reports.
The administrative control allows IGMP Membership Report messages
to be processed by network monitoring equipment such as packet
analyzers or port replicators.
The switch supporting IGMP snooping must maintain a list of
multicast routers and the ports on which they are attached. This
list can be constructed in any combination of the following ways:
a) This list should be built by the snooping switch sending
Multicast Router Solicitation messages as described in IGMP
Multicast Router Discovery [MRDISC]. It may also snoop
Multicast Router Advertisement messages sent by and to other
nodes.
b) The arrival port for IGMP Queries (sent by multicast routers)
where the source address is not 0.0.0.0.
The 0.0.0.0 address represents a special case where the switch
is proxying IGMP Queries for faster network convergence, but is
not itself the Querier. The switch does not use its own IP
address (even if it has one), because this would cause the
Queries to be seen as coming from a newly elected Querier. The
0.0.0.0 address is used to indicate that the Query packets are
NOT from a multicast router.
c) Ports explicitly configured by management to be IGMP-forwarding
ports, in addition to or instead of any of the above methods to
detect router ports.
2) IGMP networks may also include devices that implement "proxy-
reporting", in which reports received from downstream hosts are
summarized and used to build internal membership states. Such
proxy-reporting devices may use the all-zeros IP Source-Address
when forwarding any summarized reports upstream. For this reason,
IGMP membership reports received by the snooping switch must not
be rejected because the source IP address is set to 0.0.0.0.
-Thanks
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