From 71fee77968ffdb933eb7376af68e42ee240c9dc4 Mon Sep 17 00:00:00 2001
From: Claudio Jeker <claudio@cvs.openbsd.org>
Date: Tue, 27 Nov 2007 12:33:30 +0000
Subject: Don't give bad advice. The MTU/MSS issue is not solvable by changing
 the MTU of any interface of the pppoe router. The best way to get a reliable
 network connection is to use pf(4) and the max-mss scrub option. OK henning@,
 mbalmer@ Yes please! sthen@

---
 share/man/man4/pppoe.4 | 30 +++---------------------------
 1 file changed, 3 insertions(+), 27 deletions(-)

(limited to 'share/man')

diff --git a/share/man/man4/pppoe.4 b/share/man/man4/pppoe.4
index 1ba06d109ae..ecc325f6b9c 100644
--- a/share/man/man4/pppoe.4
+++ b/share/man/man4/pppoe.4
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: pppoe.4,v 1.17 2007/05/31 19:19:51 jmc Exp $
+.\"	$OpenBSD: pppoe.4,v 1.18 2007/11/27 12:33:29 claudio Exp $
 .\"	$NetBSD: pppoe.4,v 1.26 2003/10/02 07:06:36 wiz Exp $
 .\"
 .\" Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -35,7 +35,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: May 31 2007 $
+.Dd $Mdocdate: November 27 2007 $
 .Dt PPPOE 4
 .Os
 .Sh NAME
@@ -192,18 +192,6 @@ However,
 machines connecting on a private LAN will still have their MTUs set to 1500,
 causing conflict.
 .Pp
-Userland
-.Xr pppoe 8
-users do not have to worry about this issue, since
-.Xr ppp 8
-itself has an option,
-.Dq mssfixup ,
-which is enabled by default and takes care of this.
-Kernel
-.Nm
-users have to rely on other methods:
-.Bl -bullet
-.It
 Using a packet filter,
 the
 Maximum Segment Size (MSS)
@@ -218,20 +206,8 @@ Although in theory the maximum MSS over a PPPoE interface
 is 1452 bytes,
 1440 appears to be a safer bet.
 Note that setting the MSS this way can have undesirable effects,
-such as reducing TCP/IP throughput,
-and interfering with the OS detection features of
+such as interfering with the OS detection features of
 .Xr pf 4 .
-.It
-Setting the MTU on all interfaces being NAT'ed to 1492,
-instead of the Ethernet default, 1500.
-This can be done using
-.Xr ifconfig 8 .
-The following would set the MTU to 1492 on interface bge0:
-.Pp
-.Dl # ifconfig bge0 mtu 1492
-.Pp
-Unfortunately not all interfaces support setting the MTU at this time.
-.El
 .Pp
 See
 .Xr pf.conf 5
-- 
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