I'm still having a problem, but I think I'm a little closer to
identifying the cause, but I thought I provide a brief amount of
background.

The system I've been working with is configured so that it PXE boots
pxelinux.0; pxelinux.0's configuration file is such that the default
boot item is the OS on the system's hard drive.

The following is reproducible:

1. if I choose to load the BIOS' boot menu and opt to boot from the hard
drive...I have network connectivity

2. if PXE is allowed to run but pxelinux.0 is not available from the
tftp server...I have network connectivity

3. if  PXE is allowed to run and downloads pxelinux.0 (and the pxelinux
config file) from our tftp server...I won't have network connectivity;
this is consistent with information in my initial post...when I boot
from CD I'll either invoke the BIOS boot menu (press F8 at the
appropriate time) or press CTRL-C as soon as PXE starts

I think I wasn't accurately identifying the conditions causing the lack
of network connectivity (specifically I wasn't getting a valid DHCP
lease file in /var/lib/dhcp3). There were times when I was frustrated
waiting for the whole PXE boot sequence to run it's course when I wanted
to boot from the hard drive so, sometimes I would either use the BIOS
boot menu to boot from the hard drive or I would press CTRL-C to kill
off PXE. When I did that I had network connectivity.

-Tom

-- 
9.10(beta) - wired network auto config problem
https://bugs.launchpad.net/bugs/445550
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