Post Mortem
Marlinspike had this error many many times in /var/log/messages before 8:45 croak:
May 18 08:43:37 marlinspike kernel: xen_net: Memory squeeze in netback driver.
Marlinspike seems to be auto-restarting when it crashes... nice!
Made better startup script to launch vms on boot on marlinspike
Made edison2 take 85.15 on boot
Arthur2 fake config had wrong FORIEGN_MAC_ADDR, fixed
Made Zephir1 take 85.2 on boot
Made arthur1 start nagios on boot