[PATCH] icmp.7: Document net.ipv4.ping_group_range knob.

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Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@xxxxxxxxxxxxxxxx>
---
 man7/icmp.7 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/man7/icmp.7 b/man7/icmp.7
index ea86cb4..2f9d370 100644
--- a/man7/icmp.7
+++ b/man7/icmp.7
@@ -158,6 +158,11 @@ Maximum rate for sending
 packets.
 These packets are
 sent to prevent loops when a packet has crossed too many hops.
+.TP
+.IR ping_group_range " (two integers; default: see below; since Linux 2.6.39)"
+Range of group IDs (minimum and maximum group IDs, inclusive)
+allowed to create ICMP Echo sockets.  Default is "1 0", which
+means no group is allowed to create ICMP Echo sockets.
 .SH VERSIONS
 Support for the
 .B ICMP_ADDRESS
-- 
1.9.1

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