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xen-users
Re: [Xen-users] what creates the veth* devices?
On Fri, 6 Jul 2007, Mark Williamson wrote:
What creates the veth* devices and is it necessary to have them in
order to have correct / functional networking?
What makes you think you should have them? They were present in some
versions of Xen and not in others (I regret I can't remember how the
network was set up in 3.0.3).
Nothing makes me think that I should have them. If I use "network-bridge"
they show up. Looking at the network-bridge script, it wasn't immediately
obvious (or even not so immediately obvious) what creates the veth
devices. There doesn't appear to be any documentation online (that I
could find at least) saying what creates them or whether or not they're
required.
I'm using Xen 3.0.3 on Debian Etch. I have my dom0 networking being built
using standard Debian configuration in /etc/network/interfaces.
xend-config.sxp is set to use
(network-script network-dummy)
My domU configurations are set with
vif = [ 'type=ioemu, bridge=xenbr772' ]
Everything seems to be working as near as I can tell, except that I
don't have any veth* devices. My domUs all have a vif device that
shows up as part of the correct bridge when the domU starts up. Do I
need those?
The vif devices are a representation of what the netback driver is up
to. Logically, each vif device in dom0 is connected via "virtual
crossover" to a vif in a guest. Because of this, you need them to be
up, or you won't be able to access the guest's network card (and vice
versa).
Sorry, that was really bad writing on my part: that bit was meant to be a
further explanation of the first sentence of my email, explaining that my
configuration without the veth* devices seems to be working and has the
right bridges and vif* devices.
The question was actually to find out if I need (for whatever reason) the
veth* devices. I don't appear to need them, but as I said there isn't a
lot of documentation for non-default setups, and most of what I've been
able to find looks like helpful hints for modifying the default setup.
That said, do I need the veth* devices? Is there a downside to not having
them? Am I missing out on anything by configuring the bridge setup using
the normal Debian /etc/network/interfaces in dom0 instead of trying to
modify network-bridge to work with bonded interfaces and vlans?
-Chris
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