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RE: [Xen-devel] Ethernet MTU

from [James Harper] [Permanent Link][Original]
To: "Molle Bestefich" <molle.bestefich@xxxxxxxxx>, "Sylvain Coutant" <sco@xxxxxxxxxx>
Subject: RE: [Xen-devel] Ethernet MTU
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Wed, 16 Aug 2006 20:24:05 +1000
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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Thread-index: AcbBHaxL8ORMDxQUST6MowKoQbxwNAAAExqw
Thread-topic: [Xen-devel] Ethernet MTU 
> > Even 802.1q tags require explicitly lowering the mtu to 1496 to
work.
> 
> I thought the IP layer was supposed to fragment packets if they do not
> fit in the underlying ethernet's MTU.
> 
> (What's the point about fragmentation, otherwise?)

802.1q is an ethernet protocol (vlan tagging for trunking multiple
vlan's over the same physical interface). It lives under IP.

James

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