Login errors after network change

[Kwan Lowe]

Hello All:
I just did a Fedora12 Desktop Edition installation to hard drive and an
update. This went smoothly, but I had some errors immediately afterwards.

During the installation I don't recall being prompted for network
configuration. On initial boot, I did the normal configuration such as time
zone and LDAP server setup. Initial login went fine. Because this is a
virtual machine and accessible only via the network, I went ahead and
changed the eth0 configuration to a static IP address via the
system-config-network utility.

That's where the problem started.

After rebooting after updating all packages, I could not login. The system
was attempting to authenticate via the LDAP server but when switching from
DHCP to static it apparently also sets the onboot flag to no in the
/etc/sysconfig/network-scripts/ifcfg-eth0 file.  Logins, whether local root
or an LDAP user, would take about a minute to timeout before returning to
the login prompt.

To compound the issue, the grub timeout was set to 0 so that I couldn't even
access the grub menu to change the runlevel. I ended up booting the CD image
just to be able to set the NIC to start on boot. (Afterwards I learned about
the SHIFT key override from the "increasing grub timeout?" thread
elsewhere).

No harm done, but I am curious as to the rationale for the interface not
being enabled after reconfiguration from DHCP to static. Did I miss
something in the configuration that would enable it?
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