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:

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