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[Xen-users] domU networking problem (corrected with more data)

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Subject: [Xen-users] domU networking problem (corrected with more data)
From: Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>
Date: Thu, 26 Aug 2010 09:55:57 -0400
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[oops - hit send before adding details about latest test]

Hi Folks,

I have a DomU that was working just fine, but now it seems unable to obtain a network address.

On boot, I'm getting a series of DHCPDISCOVER messages in the log, followed by "No DHCPOFFERS received."

But... the router/dhcpserver seems to be working:
- other machines on the same LAN are picking up addresses
- I released and then renewed Dom0's lease, and it worked just fine

But now, after a reboot, the DomU no longer seems to be able to reach the DHCP server.

Just to make things even weirder, I just created a clean DomU, and IT can't pick up an IP address either.

I'm guessing that something I installed in Dom0 (xnest possibly) messed up something about my virtual networking configuration - but I can't figure out what.

Any suggestions on what might be going on, or how to diagnose things? I'm not completely clear on all the various steps a DHCPDISCOVER message goes through - as it flows through all the virtual networking "stuff" - particularly before an IP address is assigned and everything is at the virtual ethernet level.

Thanks Very Much,

Miles Fidelman

In theory, there is no difference between theory and practice.
In<fnord>  practice, there is.   .... Yogi Berra

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