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Date:      Wed, 14 Feb 2007 22:12:03 +0500
From:      sai <sonicsai@gmail.com>
To:        "Jeffrey Goldberg" <jeffrey@goldmark.org>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: kernel: vr0: discard oversize frame
Message-ID:  <41d04d600702140912q63e6f435u66b900fda8c2e7f8@mail.gmail.com>
In-Reply-To: <4E4A0AA3-368A-46BF-A6B0-F70D8F6072D0@goldmark.org>
References:  <41d04d600702132147t7f6b05d2uc87baaccdbf81d36@mail.gmail.com> <200702140207.14663.josh@tcbug.org> <41d04d600702140423k49577bfdi1864844f4c38f5e2@mail.gmail.com> <4E4A0AA3-368A-46BF-A6B0-F70D8F6072D0@goldmark.org>

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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

>



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