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[src/trunk]: src/share/man/man4 Note that opening and closing the tun/tap dev...
details: https://anonhg.NetBSD.org/src/rev/276f5ef04c5a
branches: trunk
changeset: 1014640:276f5ef04c5a
user: roy <roy%NetBSD.org@localhost>
date: Sun Sep 27 19:36:54 2020 +0000
description:
Note that opening and closing the tun/tap devices affects link state.
And how this influences Duplicate Address Detection.
diffstat:
share/man/man4/tap.4 | 10 +++++++++-
share/man/man4/tun.4 | 12 ++++++++++--
2 files changed, 19 insertions(+), 3 deletions(-)
diffs (57 lines):
diff -r 696e323a3128 -r 276f5ef04c5a share/man/man4/tap.4
--- a/share/man/man4/tap.4 Sun Sep 27 19:25:54 2020 +0000
+++ b/share/man/man4/tap.4 Sun Sep 27 19:36:54 2020 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: tap.4,v 1.14 2020/09/27 15:19:04 roy Exp $
+.\" $NetBSD: tap.4,v 1.15 2020/09/27 19:36:54 roy Exp $
.\"
.\" Copyright (c) 2004, 2005 The NetBSD Foundation.
.\" All rights reserved.
@@ -159,6 +159,14 @@
.Dv PF_LINK
socket, as it is not available on
the ioctl handler of the character device interface.
+.Ss LINK STATE
+When an application has opened the
+.Nm
+character device the link is considered up, otherwise down.
+As such, it is best to open the character device once connectivity has
+been established so that Duplicate Address Detection, if applicable,
+can be performed.
+If connectivity is lost, the character device should be closed.
.Sh FILES
.Bl -tag -compact -width /dev/tap[0-9]*
.It Pa /dev/tap
diff -r 696e323a3128 -r 276f5ef04c5a share/man/man4/tun.4
--- a/share/man/man4/tun.4 Sun Sep 27 19:25:54 2020 +0000
+++ b/share/man/man4/tun.4 Sun Sep 27 19:36:54 2020 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: tun.4,v 1.24 2019/03/26 09:58:20 pgoyette Exp $
+.\" $NetBSD: tun.4,v 1.25 2020/09/27 19:36:54 roy Exp $
.\"
.\" Copyright (c) 1996-2006 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd April 8, 2006
+.Dd September 27, 2020
.Dt TUN 4
.Os
.Sh NAME
@@ -272,6 +272,14 @@
If the interface is up when the data device is not open
output packets are always thrown away rather than letting
them pile up.
+.Ss LINK STATE
+When an application has opened the
+.Nm
+character device the link is considered up, otherwise down.
+As such, it is best to open the character device once connectivity has
+been established so that Duplicate Address Detection, if applicable,
+can be performed.
+If connectivity is lost, the character device should be closed.
.Sh SEE ALSO
.Xr inet 4 ,
.Xr intro 4
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