Date: Tue, 2 Sep 2008 23:08:57 +0200 (CEST) From: Helge Oldach <freebsd-bridge-sep08@oldach.net> To: FreeBSD-gnats-submit@FreeBSD.org Cc: philip@FreeBSD.org Subject: kern/127053: Still bridge issues - with L2 protocols such as PPPoE Message-ID: <200809022108.m82L8vbO052822@sep.oldach.net> Resent-Message-ID: <200809022130.m82LU3Em091748@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 127053 >Category: kern >Synopsis: Still bridge issues - with L2 protocols such as PPPoE >Confidential: no >Severity: serious >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Sep 02 21:30:03 UTC 2008 >Closed-Date: >Last-Modified: >Originator: Helge Oldach >Release: FreeBSD 6.4-1330 i386 >Organization: >Environment: System: FreeBSD localhost 6.4-1330 FreeBSD 6.4-1330 #0: Tue Sep 2 18:34:28 CEST 2008 toor@localh ost:/usr/obj/usr/src/sys/HMO i386 >Description: Since the "MAC inheritance" change in if_bridge (SVN r180140) I observe loss of connectivity due to ARP timeouts and also layer-2 connectivity issues. The change below (and the according MFCs) indeed fixes the ARP bridging issue, but does not fix layer-2 protocols. For instance, I run a bridge with a wi0 and an fxp0 interface, while talking PPPoE over the fxp0 interface simultaneously. I observe that the change below fixes my IP connectivity issue over the bridge, but PPPoE is still broken. I still need to change the Ethernet address of bridge0 (disable inheritence of the bridge's MAC address from the first member interface) to make it work. So I would suggest that a true fix should be implemented in if_bridge, not in the IP stack. The issue applies identically to CURRENT, 7-STABLE and 6-STABLE. Revision 1.174: download - view: text, markup, annotated - select for diffs Mon Aug 18 09:06:11 2008 UTC (2 weeks, 1 day ago) by philip Branches: MAIN Diff to: previous 1.173: preferred, colored Changes since revision 1.173: +24 -1 lines SVN rev 181824 on 2008-08-18 09:06:11Z by philip Fix ARP in bridging scenarios where the bridge shares its MAC address with one of its members (see my r180140). Pointy hat to: philip Submitted by: Eygene Ryabinkin <rea-fbsd@codelabs.ru> MFC after: 3 days >How-To-Repeat: Set up PPPoE over a bridge member interface... >Fix: Eygene supplied a patch that supposedly fixes this issue by introducing a sysctl that makes the former if_bridge behaviour default, and which must be turned on to enable MAC inheritance. I have not tested this patch yet. I wonder what the purpose of MAC inheritance is anyway... Multiple unicast MACs in one segment sounds pretty odd. >Release-Note: >Audit-Trail: >Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200809022108.m82L8vbO052822>