IGMP: Document igmp_link_local_mcast_reports

Document the addition of a new sysctl variable which controls the generation of IGMP reports for link local multicast groups in the 224.0.0.X range. IGMP reports for local multicast groups can now be optionally inhibited by setting the value to zero e.g.: echo 0 > /proc/sys/net/ipv4/igmp_link_local_mcast_reports To retain backwards compatibility the previous behaviour is retained by default on system boot or reverted by setting the value back to non-zero. Signed-off-by: Philip Downey <[email protected]> Signed-off-by: David S. Miller <[email protected]>
mrcsosa · Aug 31, 2015 · 87583eb · 87583eb
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commit 87583eb
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diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
@@ -1201,6 +1201,11 @@ xfrm4_gc_thresh - INTEGER
 	destination cache entries.  At twice this value the system will
 	refuse new allocations.
 
+igmp_link_local_mcast_reports - BOOLEAN
+	Enable IGMP reports for link local multicast groups in the
+	224.0.0.X range.
+	Default TRUE
+
 Alexey Kuznetsov.
 [email protected]