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[Xen-users] VIF interface gets IP adress and is used as 2nd default route

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: "Stuecker, Sebastian" <sebastian.stuecker@xxxxxxxxxxxxxx>
  • Date: Thu, 27 Nov 2014 20:08:10 +0000
  • Accept-language: de-DE, en-US
  • Delivery-date: Thu, 27 Nov 2014 20:09:49 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: AdAKfao92e+FxQcCROeDK6lmk1opeQ==
  • Thread-topic: VIF interface gets IP adress and is used as 2nd default route



I have posted the following in the Q/A Forum and was adviced there to post it also to this mailing list.

I have setup a xen system for the first time in the following configuration:

Ubuntu 14.10 Dom0, clean, only xen-stuff installed on top

- Ubuntu 14.10 DomU
- Windows 8.1. DomU (for testing purposes only)
- Windows Server 2012 DomU

I have a running Bridge-Configuration (xenbr0) as found in the different tutorials. My /etc/network/interfaces is this:


The network works super as long as there are no DomUs running.

ifconfig and route outputs:

Running then the Ubuntu-Guest (PV) is also fine. A new interface is added, but thats normal.


After running the WIndows8-DomU (HVM) it looks like this, also still working:


However, when I start the Windows Server HVM the problem starts. I suspect it is because this machine has a running DHCP server, so it seems to assign an IP to the VIF-Interface which is then also added into the routing table as default IF. After that the network does not fully work any more (obviously with 2 default routes like this). But how can I prevent this from happening?



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