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Date:   Mon, 11 Feb 2019 10:17:06 +0100
From:   Phil Sutter <phil@....cc>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org,
        William Flanagan <bill@...nagan-consulting.com>
Subject: [iproute PATCH] man: ip-link: Describe promisc mode

Briefly explain what it is and where it's typically used.

Signed-off-by: Phil Sutter <phil@....cc>
---
 man/man8/ip-link.8.in | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index 73d37c190fffa..5c327f01b6b45 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -1780,6 +1780,14 @@ flag on the device. Indicates that address can change when interface goes down (
 .B NOT
 used by the Linux).
 
+.TP
+.BR "promisc on " or " promisc off"
+change the
+.B PROMISC
+flag on the device. This requests receipt of all packets arriving at the NIC
+irrespective of their destination MAC address. It is typically used by traffic
+sniffers and also set by Linux bridges for their ports.
+
 .TP
 .BI name " NAME"
 change the name of the device. This operation is not
-- 
2.20.1

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