NetBSD Problem Report #46668
From is@beverly.kleinbus.org Sat Jul 7 16:14:53 2012
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Date: Sat, 7 Jul 2012 18:14:41 +0200 (CEST)
From: is@netbsd.org
Reply-To: is@netbsd.org
To: gnats-bugs@gnats.NetBSD.org
Subject: wm reconfigures losing carrier when MTU is set.
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>Number: 46668
>Category: kern
>Synopsis: wm reconfigures losing carrier when MTU is set.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: msaitoh
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Jul 07 16:15:00 +0000 2012
>Last-Modified: Sat Dec 14 20:55:01 +0000 2019
>Originator: Ignatios Souvatzis
>Release: NetBSD 6.0_BETA2
>Organization:
seal your e-mail: http://www.gnupg.org/
>Environment:
System: NetBSD henrietta 6.0_BETA2 NetBSD 6.0_BETA2 (GENERIC) #1: Wed Jun 27 01:02:47 CEST 2012 is@henrietta:/var/itch/sources/6/obj.amd64/sys/arch/amd64/compile/GENERIC amd64
Architecture: amd64
Machine: amd64
>Description:
Jul 7 17:59:40 henrietta dhcpcd[5541]: wm0: carrier acquired
Jul 7 17:59:40 henrietta dhcpcd[5541]: wm0: sending IPv6 Router Solicitation
Jul 7 17:59:40 henrietta dhcpcd[5541]: wm0: rebinding lease of 10.202.254.5
Jul 7 17:59:41 henrietta dhcpcd[5541]: wm0: Router Advertisement from fe80::200:24ff:fec0:d80
Jul 7 17:59:41 henrietta dhcpcd[5541]: wm0: acknowledged 10.202.254.5 from 10.202.254.126 `marie'
Jul 7 17:59:41 henrietta dhcpcd[5541]: wm0: checking for 10.202.254.5
Jul 7 17:59:47 henrietta dhcpcd[5541]: wm0: leased 10.202.254.5 for 43200 seconds
Jul 7 17:59:47 henrietta dhcpcd[8481]: wm0: wm0: MTU set to 1480
Jul 7 17:59:48 henrietta dhcpcd[5541]: wm0: carrier lost
Jul 7 17:59:48 henrietta dhcpcd[13880]: wm0: wm0: MTU restored to 1500
Jul 7 17:59:49 henrietta dhcpcd[5541]: wm0: carrier acquired
Result: ping6 gets a delay of about 700ms every 6 seconds, IPv4
connections (e.g. to the server's lpd) are impossible.
>How-To-Repeat:
Add "options interface-mtu 1480;" to the DHCP server's dhcpd.conf
>Fix:
Workaround: remove the "options interface-mtu 1480;" from the
clients dhcpcd.conf, or make it not apply to that client on
dhcpd.conf
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: kern-bug-people->msaitoh
Responsible-Changed-By: msaitoh@NetBSD.org
Responsible-Changed-When: Mon, 04 May 2015 10:22:36 +0000
Responsible-Changed-Why:
mine.
From: Roy Marples <roy@marples.name>
To: gnats-bugs@NetBSD.org
Cc:
Subject: Re: kern/46668 wm reconfigures losing carrier when MTU is set.
Date: Sat, 14 Dec 2019 20:51:44 +0000
This should be worked around dhcpcd-7 and newer by setting MTU on routes
rather than the interface.
You can install that from pkgsrc.
Roy
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.39 2013/11/01 18:47:49 spz Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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