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[Xen-devel] Re: [Fedora-xen] IP addresses used by domU

To: Sanjam Garg <sanjamg@xxxxxxxxx>
Subject: [Xen-devel] Re: [Fedora-xen] IP addresses used by domU
From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
Date: Thu, 21 Sep 2006 18:21:47 +0100
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On Thu, Sep 21, 2006 at 05:21:29AM -0700, Sanjam Garg wrote:
> Hi
>  I am having FC5 guest run on top FC5 host.I have  configured the virtual
> network card for FC5 in the guest operating  system.This network card is
> expected to have been allotted many IP  addresses.Is there a secure way
> in Xen to get information as to what  are those IP's?

You don't mention what mode you've got the Xen Dom0 networking in, but I'll
assume you're using the Fedora default which is bridging. With bridging, each
DomU's virtual NIC gets pretty much directly connected to the physical LAN.
As such Dom0 has no involvement in assigning IP addresses. The DomU will get
its IP address either manually (DomU admin setting it in /etc/sysconfig/...)
or automatically via DHCP. With bridging there isn't really any 100% reliable
way to determine what the DomU's IP address is from Dom0.  You can take a
best guess by sniffing the network traffic on the vif, but that's all it
is - a best 'guess'.

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