From owner-freebsd-questions@FreeBSD.ORG  Wed Feb 14 17:12:09 2007
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Date: Wed, 14 Feb 2007 22:12:03 +0500
From: sai <sonicsai@gmail.com>
To: "Jeffrey Goldberg" <jeffrey@goldmark.org>
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References: <41d04d600702132147t7f6b05d2uc87baaccdbf81d36@mail.gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: kernel: vr0: discard oversize frame
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On 2/14/07, Jeffrey Goldberg <jeffrey@goldmark.org> wrote:
> On Feb 14, 2007, at 6:23 AM, sai wrote:
>
> > mtu is currently 1500.  "ifconfig vr0 mtu 1532" leaves the mtu
> > unchanged, but  if I try to reduce it then  it does work,
> > "ifconfig vr0 mtu 1498"  sets mtu to 1498.  Looks like that 1500 is
> > the max that the vr driver/card will accept.
>
> I have a vr0 with the mtu 1500 and so far (four days only) I've had
> no problems.  But I'm not (yet) running pf, and unlike your case, my
> mini-ITX box is sitting behind a firewall instead of acting as one.
>
> -j
>

Searching leads me to believe that this sort of packet is probably
generated by some broken switch/router somewhere on the ISPs network
(maybe a client). However it is worrying that its quite simple to
shutdown a FreeBSD machines network access.

sai

>