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

[Simon Capstick <simon@xxxxxxxxxxxxxxxx>]

RumbelStelskin wrote:
> yes, but this arrangement would create a vlan inside a single host (or
> am i wrong?)..
> what if i want to vlanify domUs in different hosts (hosts in different
> subnets too)?
> and with the added complexity of several such disparate vlans in this
> network of xen hosts
>
>
> Simon Capstick wrote:
> > 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
The Xen created network bridge attached to the VLAN interface on Dom0 
(not eth0) sends the appropriate traffic out to your physical network 
switch.  It is my understanding that the VLAN interface is simply 
tagging packets and then sending them on over the specified physical 
interface (and receiving the correctly VLAN tagged packets too). 
Assuming you have set-up your switch correctly and other Dom0s with the 
same config then they should be able to communicate.
Of course reality may bite, and you may find problems with VLANs and Xen 
as discussed in posts in the list archive.  But I assume the problems 
are now gone, or there are workarounds.
Simon


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