From owner-freebsd-bugs@FreeBSD.ORG  Tue Dec  6 10:06:02 2005
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
X-Original-To: freebsd-bugs@hub.freebsd.org
Delivered-To: freebsd-bugs@hub.freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 997AF16A420;
	Tue,  6 Dec 2005 10:06:02 +0000 (GMT)
	(envelope-from glebius@FreeBSD.org)
Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 612F643D53;
	Tue,  6 Dec 2005 10:06:02 +0000 (GMT)
	(envelope-from glebius@FreeBSD.org)
Received: from freefall.freebsd.org (glebius@localhost [127.0.0.1])
	by freefall.freebsd.org (8.13.3/8.13.3) with ESMTP id jB6A62j6039167;
	Tue, 6 Dec 2005 10:06:02 GMT
	(envelope-from glebius@freefall.freebsd.org)
Received: (from glebius@localhost)
	by freefall.freebsd.org (8.13.3/8.13.1/Submit) id jB6A62G1039163;
	Tue, 6 Dec 2005 10:06:02 GMT (envelope-from glebius)
Date: Tue, 6 Dec 2005 10:06:02 GMT
From: Gleb Smirnoff <glebius@FreeBSD.org>
Message-Id: <200512061006.jB6A62G1039163@freefall.freebsd.org>
To: fboechat@yahoo.com, glebius@FreeBSD.org, freebsd-bugs@FreeBSD.org
Cc: 
Subject: Re: bin/89979: [ppp] PPPoE server permit two clients with the same
	ip address
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Dec 2005 10:06:02 -0000

Synopsis: [ppp] PPPoE server permit two clients with the same ip address

State-Changed-From-To: open->closed
State-Changed-By: glebius
State-Changed-When: Tue Dec 6 10:01:54 GMT 2005
State-Changed-Why: 
Actually the PPP software or RADIUS should take care about colliding
client IP addresses. Historically PPP software didn't do this relying
on the fact that kernel will refuse such configuration. Meanwhile
this configuration is valid and in some cases it is useful, and thus
since FreeBSD 5.4-RELEASE kernel doesn't refuse same IP addresses
on different interfaces.

To assist software that relies on the old behavior a helper sysctl
is available - net.inet.ip.same_prefix_carp_only. To get the old
behavior you need to add the following line to your /etc/sysctl.conf:

net.inet.ip.same_prefix_carp_only=1

http://www.freebsd.org/cgi/query-pr.cgi?pr=89979