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Date:      Wed, 16 Jan 2002 13:37:39 -0800
From:      "Kevin Oberman" <oberman@ptavv.es.net>
To:        mdavis@cts.com
Cc:        freebsd-stable@freebsd.org, "'Richard Shaw'" <Richard.Shaw@mondus.com>
Subject:   Re: PCI Wavelan cards under 4.4 
Message-ID:  <20020116213739.AE4025D13@ptavv.es.net>
In-Reply-To: Your message of "Wed, 16 Jan 2002 12:16:52 PST." <001b01c19eca$bcac85d0$b617a3cd@ctsd2> 

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> From: "Morgan Davis" <morgan.davis@hosting.com>
> Date: Wed, 16 Jan 2002 12:16:52 -0800
> Sender: owner-freebsd-stable@FreeBSD.ORG
> 
> I have one of these working with 4.5-PRERELEASE:
> 
> 	http://www.addtron.com/products/awa100.htm
> 
> I bought it only because it said it was compatible with Linux, and was
> thrilled to see that it worked with FreeBSD.  I'm getting about 5+ Mbps
> over it.
> 
> The only problem, which I reported here a couple weeks ago, is that I
> regularly get kernel messages on the console about "oversized packets".
> Other than annoying, it doesn't seem to be a problem.  Does anyone know
> if those messages indicate a real error situation that can be fixed on
> my end, is this just debug output, or what?

Oversized packets are usually from on of two sources:

1. Duplex mis-match. (This should also produce CRC and framing
errors). Auto-negotiation of duplex often fails. We always lock our
ports down if they are permanently connected to a device. Speed
detection is quite reliable.

2. 802.1q VLAN trunking. The VLAN header expands the packet by 2
octets which exceeds the old 802.3 limit on frame size for full 1500
byte packets. Lowering the MTU by 2 on the sending systems might fix
this, but the header is normally removed by the last switch to process
the frame. This might indicate a mis-configured switch.

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634

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