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[Xen-users] Re: [Xen-devel] Ethernet MTU

To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Subject: [Xen-users] Re: [Xen-devel] Ethernet MTU
From: "Molle Bestefich" <molle.bestefich@xxxxxxxxx>
Date: Wed, 16 Aug 2006 12:36:54 +0200
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, Sylvain Coutant <sco@xxxxxxxxxx>
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James Harper wrote:
802.1q lives under IP.

That's right.

But the VLAN exposes a virtual interface.
That virtual interface should automatically have an MTU size of the
underlying interface minus 4 bytes (for the VLAN tag).

And then IP fragmentation, working on top of that virtual Ethernet
interface, should perform fragmentation correctly.

Sorry if I was unclear.

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