WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

RE: [Xen-devel] Ethernet MTU

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
Delivery-date: Wed, 16 Aug 2006 03:26:32 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <62b0912f0608160318q5162b80t5e5a78175b01af76@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel