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Re: [Xen-devel] Xen and VLANs



Evan Bigall wrote:

I am using Xen 2.0 with Mandrake 10.1 based hosts and guests.

There seems to be some sort of issue with VLANs and MTUs?

Why bother use VLANS in dom-U?

My VMs have two nics, each connected to a separate bridge.

In Dom1, I do:
vconfig add eth1 5
ip addr add 10.20.8.17/24 broadcast 10.20.8.255 dev eth1.5
ifconfig eth1.5 up

In Dom2, I do:

vconfig add eth1 5
ip addr add 10.20.8.18/24 broadcast 10.20.8.255 dev eth1.5
ifconfig eth1.5 up

Pinging from Dom2 to Dom1, packet sizes smaller than 1469 work, packet sizes of 1469 and larger just hang.

If I set the MTU on the interface down to 1450, I can then ping with any packet size.

Has any done any experimentation with VLANs on Xen? A problem is that the bridge does not support VLANs but I'm trying to work around that in a variety of ways.

I use bridge, setup VLANS on Domain-0, and bridge each eth0.x on Domain-0 to ethy on dom-U.
That way dom-U only sees eth0, eth1, eth2, and so on. It works flawlessly.

Regards,

Fajar


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