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

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

[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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