On Sat, Feb 11, 2017 at 11:58:10AM -0500, W. Michael Petullo wrote:
> >> Is anyone running a Windows HVM guest with networking? I recently tried
> >> to connect a Windows 7 HVM guest to my network using vif-nat. For some
> >> reason, the setup does not work. Oddly, Dom0 lists the vif interface
> >> associated with the guest as "NO-CARRIER" even though the DomU Windows
> >> guest seems to recognize its virtual network interface (RTL8139C+).
> >> 
> >> I have no problem with a similarly configured guest running Linux.
> >> 
> >> I am using:
> >> 
> >> xen-4.7.1-6.fc25.x86_64
> >> 
> >> The guest configuration is:
> >> 
> >> name      = "windows64"
> >> memory    =  2048
> >> vcpus     =  1
> >> builder   = "hvm"
> >> altp2mhvm = 1
> >> vif       = [ "script=vif-nat,ip=10.0.0.2/32,gatewaydev=wlp3s0" ]
> >> disk      = [ "tap2:tapdisk:aio:/path/to/disk-windows64.img,xvda,w",
> >>               "tap2:tapdisk:aio:/path/to/spare-vfat.img,xvdb,w" ]
> >> serial    = "pty"
> >> sdl       = 1
> 
> > Does it work if you use the default vif bridge?
> 
> It does indeed. I switched to vif-bridge, and everything worked. I am
> a little suprised by this, because I thought from the point of view
> of Xen both of these configurations were rather similar; I thought the
> difference was in the Dom0 network configuration.
>

Yeah it sounds like vif-nat is broken in that version of Xen, or on Fedora..
 
> The reason I prefer vif-nat is that it makes using my WiFi interface
> easier. I have to go through some trouble to bridge vif/Ethernet to WiFi.
> 

Well, you can still easily use NAT by setting up a dedicated bridge, which is 
set to NAT the traffic (outside of Xen, on your distro networking 
scripts/tools). That way xen uses vif-bridge to connect to the "nat-bridge", 
and you get NAT for the VM, and it works perfectly OK with wifi or whatever 
connection you have available in dom0.

Easiest way is to use the "virbr0" provided by libvirt networking. 

> I am left with another question: does this mean there is a bug in Xen
> or the vif-nat script? If there is a bug, what else could I provide to
> help fix it?
> 

You probably should report it to xen-devel.

> -- 
> Mike
> 
> :wq


-- Pasi
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