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

  • To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • 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>
  • Delivery-date: Wed, 16 Aug 2006 03:40:05 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>
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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