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Re: [Xen-devel] Ethernet MTU

To: Sylvain Coutant <sco@xxxxxxxxxx>
Subject: Re: [Xen-devel] Ethernet MTU
From: Adrian Chadd <adrian@xxxxxxxxxxxxxxx>
Date: Wed, 16 Aug 2006 20:12:56 +0800
Cc: 'xen-devel' <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Wed, Aug 16, 2006, Sylvain Coutant wrote:
> Hi,
> Is there any plan to raise supported ethernet mtu above 1500 ? Currently, 
> packets are dropped above this point (tested against xen-3.0.2-testing). Even 
> 802.1q tags require explicitly lowering the mtu to 1496 to work.

Keeping this -just- on xen-devel -

Which interface are you talking about being > 1500 bytes?

Are you trunking a VLAN into a server via domU and then using
the bridging code to split these vlans up across different

Or are you bringing in a VLAN trunk into a domU somehow and
running vlans inside the domU?

(Snip discussion about IP, fragmentation and the like. Its useful
to understand -why- there's a problem but not to understand
what you're trying to do; and thusly what needs fixing.)


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