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Date: Wed, 7 Feb 2001 12:45:05 -0800 (PST)
From: tburgess@whitley.unimelb.edu.au
To: freebsd-gnats-submit@FreeBSD.org
Subject: flaky connection through vlan interface
X-Send-Pr-Version: www-1.0

>Number:         24937
>Category:       kern
>Synopsis:       flaky connection through vlan interface
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 07 12:50:01 PST 2001
>Closed-Date:    Thu May 31 03:46:11 PDT 2001
>Last-Modified:  Thu May 31 03:53:40 PDT 2001
>Originator:     Tim Burgess
>Release:        4.2-release
>Organization:
>Environment:
FreeBSD death.whitley.unimelb.edu.au 4.2-RELEASE FreeBSD 4.2-RELEASE #1: Tue Jan 30 11:19:00 EST 2001     root@death.whitley.unimelb.edu.au:/usr/src/sys/compile/DEATH  i386
>Description:
We have three vlans connected to a parent interface rl0, and have had flaky connections through the server since it was set up this way.  After much experimentation, it turns out that disabling the vlan interface and shifting one of the connections to it's own real NIC fixes the problem.  The NIC rl0 is not faulty, as it is still acting as the external connection to the internet (the machine is a firewall/gateway/NAT box).
>How-To-Repeat:
See above.
>Fix:
Buy another NIC until you run out of PCI slots like we have :(


>Release-Note:
>Audit-Trail:

From: Yar Tikhiy <yar@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org,
	tburgess@whitley.unimelb.edu.au, yar@freebsd.org
Cc:  
Subject: Re: kern/24937: flaky connection through vlan interface
Date: Wed, 28 Mar 2001 15:33:39 +0400

 Was it TCP that was flaky?
 
 Have you considered the low MTU of the VLAN interfaces
 as a possible source of the troubles?
 Maybe path MTU discovery wasn't working for some reason.
 
 --
 Yar
State-Changed-From-To: open->closed 
State-Changed-By: yar 
State-Changed-When: Thu May 31 03:46:11 PDT 2001 
State-Changed-Why:  
It must be a path MTU discovery problem due to bogus ICMP filtering 
or whatever else. 
If the originator had supplied us with relevant details in the past 
two months, we would have given him a more accurate advice... 

http://www.FreeBSD.org/cgi/query-pr.cgi?pr=24937 
>Unformatted:
