booting thin clients and firestarter

[DB Clinton]

My perfectly working thin-client network was brought down after I installed
Firestarter. Even after a complete uninstall of Firestarter, I am unable to
even ping between boxes – although syslog on the server clearly sees,
recognizes the MAC addresses and even offers ip addresses to the other
boxes:

Examples:

Jan 31 13:02:17 edubuntu dhcpd: DHCPDISCOVER from 00:50:da:d0:c6:af via eth1


Jan 31 13:02:18 edubuntu dhcpd: DHCPOFFER on 192.168.0.244 to
00:50:da:d0:c6:af via eth1

and

Jan 31 11:52:00 edubuntu dhcpd: DHCPDISCOVER from 00:2a:43:ae:30:94 via eth1


Jan 31 11:52:01 edubuntu dhcpd: DHCPOFFER on 192.168.0.248 to
00:2a:43:ae:30:94 via eth1

As this is the second configuration with which I seem to have had this
problem (this being on an entirely different install on an entirely
different computer). To my knowledge, nothing of consequence has changed
since a few days ago when everything is working: my ltsp/dhcpd.conf file is
identical to the recommended setup at
http://www.edubuntu.org/GettingStarted(besides an added if/else filter
to chose between
nbi.img and pxelinux.0 - I tried replacing that filter with a simple
"filename "/ltsp/pxelinux.0";" line to no avail) and I've removed the
"authoritative" from etc/dhcp3/dhcpd.conf that had been placed by
firestarter).

I'm about ready to give up on this experiment. Any ideas?

Thanks.
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