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Update and clarify pflog man page

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The pflog0 interface is created when the module is loaded, this can
be triggered by pf and pflogd being enabled or by kldloading the module.

By default the interface would be pflog0, add the ifconfig stage of the
example to make this example clearer.

Reviewed by:	kp, bz, bcr, jtl, 0mp
Approved by:	jtl (mentor), bz (mentor)
Differential Revision:	https://reviews.freebsd.org/D19861
This commit is contained in:
Tom Jones 2019-04-16 13:31:16 +00:00
parent e8ee7d9035
commit 76fe80844b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=346274
1 changed files with 12 additions and 5 deletions
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17
share/man/man4/pflog.4
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd May 31, 2007
.Dd April 9, 2019
.Dt PFLOG 4
.Os
.Sh NAME
@ -47,13 +47,18 @@ on the
interface, or stored to disk using
.Xr pflogd 8 .
.Pp
The pflog0 interface is created automatically at boot if both
The pflog0 interface is created when the
.Nm
module is loaded;
further instances can be created using
.Xr ifconfig 8 .
The
.Nm
module is loaded automatically if both
.Xr pf 4
and
.Xr pflogd 8
are enabled;
further instances can be created using
.Xr ifconfig 8 .
are enabled.
.Pp
Each packet retrieved on this interface has a header associated
with it of length
@ -87,6 +92,8 @@ Create a
interface
and monitor all packets logged on it:
.Bd -literal -offset indent
# ifconfig pflog create
pflog1
# ifconfig pflog1 up
# tcpdump -n -e -ttt -i pflog1
.Ed