Date: Fri, 26 Dec 2003 15:15:03 -0800 From: Michael Sierchio <kudzu@tenebras.com> To: Stephane Raimbault <segr@hotmail.com> Cc: net@freebsd.org Subject: Re: VLAN MTU problem in 4.9 ? Message-ID: <3FECC0F7.6090309@tenebras.com> In-Reply-To: <Law10-F82B6Uw54USi00005e59b@hotmail.com> References: <Law10-F82B6Uw54USi00005e59b@hotmail.com>
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Stephane Raimbault wrote:
> So it seems that when I specify a ping of greater then 1468 the pings
> stop responding to the vlan interface on the freebsd router?
>
> I also did a tcpdump while doing these pings from the freebsd router and
> it doesn't see any packets when specifying a ping of 1469, but it sees
> the ping with pkt size specified to 1468.
>
> Any thoughts on this problem that I'm having? Any other data I can
> provider perhaps?
DF? Size of tagged frames? Recall that "packet size" perhaps not
what you think, also.
Have you read the vlan man page, specifically:
Note: Unless marked as having native support for vlan, the above drivers
don't inform the vlan driver about their long frame handling capability.
Just increase the MTU of a vlan interface if it appears to be lower than
1500 bytes after attaching to a parent known to support long frames.
But you invite speculation -- a raw tcpdump (-nqvv or so) would
be nice.
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