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Re: [Xen-users] can VDE be used in Xen

To: RumbelStelskin <shriram@xxxxxxxxxxx>
Subject: Re: [Xen-users] can VDE be used in Xen
From: Simon Capstick <simon@xxxxxxxxxxxxxxxx>
Date: Wed, 30 Jan 2008 12:50:41 +0000
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RumbelStelskin wrote:
virtual distributed ethernet


Todd Deshane wrote:
what is VDE?

On Jan 29, 2008 2:14 AM, RumbelStelskin <shriram@xxxxxxxxxxx <mailto:shriram@xxxxxxxxxxx>> wrote:

    i have spent the last 5 hours searching for some
    post/blog/experience on
    VDE Xen combo. but to no avail.

    VDE seems to be popular with KVM and other non virtualized
    environments
    . Are there ways to use it with Xen, i mean, transparently connect a
    set of DomUs  in different physical hosts in different networks , to
    form one virtual network?

If this cannot be done at Dom0 side, it always can be done at the DomU
    side, where the domu plugs into a vde switch. But are there any
    ballpark
    stats on the performance drops?

    to put things in a nut shell, I am looking for some decent solution
(with acceptable levels of performance loss) to form a virtual network
    of DomUs that are spread across physical machines, across physical
    networks (some behind nats/firewalls).
    is vlan the way to go?how?

    thanks
    r


This is how I would go about it:
Use vconfig on Dom0 to create a virtual interface on a VLAN, e.g. eth0.1. Then you would edit the Xen config to use that interface rather than the default eth0, in bridge mode of course (the default?). Do the same on all your Dom0s and you have a shared DomU network. For security you should restrict which ports on your switch can use your VLAN ID, i.e. the ones with Xen servers! You will then have to decide how to connect the VLAN to the outside world, via a DomU with acting as a router or via a physical router on your network.

Simon

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