[Illumos-team] [OpenIndiana Distribution - Bug #3219] OI151A Multicast IGMP Membership Reports broken

[illumos project]

Issue #3219 has been updated by Ken Mays.

Assignee set to OI illumos


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Bug #3219: OI151A Multicast IGMP Membership Reports broken
https://www.illumos.org/issues/3219

Author: Brian Hill
Status: New
Priority: Normal
Assignee: OI illumos
Category: OS/Net (Kernel and Userland)
Target version: 
Difficulty: Medium
Tags: needs-triage


Application joins 16 multicast groups  using  setsockopt() with IP_ADD_MEMBERSHIP option.
IGMPV2 Membership Reports are then issued by the O.S. for all 16 groups.
External IGMP Querier sees membership reports and data begins flowing on those IP addresses.
The data flowing happens to be HD video transport streams at 19.2 mbit/sec each - so there is a few hundred mbit/sec of
traffic involved.

External IGMP Querier does periodic IGMPV2 Membership Queries on the ALL-SYSTEMS  address  - 224.0.0.1
O.S. responds inconsistently with IGMP V2 Membership Reports to the group addresses it has previously joined.
For example, the O.S.  may respond with Membership Reports  for 70% of the groups that were joined originally.
As a result, the Querier stops the flow of data for the groups where there were no Membership Reports.

On the next Membership Query, the O.S. may respond with a different subset of Membership Reports.

We have deployed this exact scenario successfully on a snv111b platform.
We have not determined where in the chain between that and oi151a5 that it became broken.




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