From f7015462e6265d03fab11d9a70e78d8046b7ebc8 Mon Sep 17 00:00:00 2001
From: thompsa <thompsa@FreeBSD.org>
Date: Fri, 23 Jun 2006 04:20:38 +0000
Subject: [PATCH] MFC r1.13   Document the monitor mode and explain how it can
 be used.

---
 share/man/man4/if_bridge.4 | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/share/man/man4/if_bridge.4 b/share/man/man4/if_bridge.4
index 7e79eb8a69f2..03d8c847694d 100644
--- a/share/man/man4/if_bridge.4
+++ b/share/man/man4/if_bridge.4
@@ -35,7 +35,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 29, 2006
+.Dd June 23, 2005
 .Dt IF_BRIDGE 4
 .Os
 .Sh NAME
@@ -93,6 +93,17 @@ All additional members are required to have exactly the same value.
 .Pp
 The TXCSUM capability is disabled for any interface added to the bridge, and it
 is restored when the interface is removed again.
+.Pp
+The bridge supports
+.Dq monitor mode ,
+where the packets are discarded after
+.Xr bpf 4
+processing, and are not processed or forwarded further.
+This can be used to multiplex the input of two or more interfaces into a single
+.Xr bpf 4
+stream.
+This is useful for reconstructing the traffic for network taps
+that transmit the RX/TX signals out through two separate interfaces.
 .Sh PACKET FILTERING
 .Pp
 Packet filtering can be used with any firewall package that hooks in via the