The syslog would countain multiple lines of
As it turns out it is most likely a bug in the Dbox's implementation of the dhcp client and is known in debian's BTS: http://bugs.debian.org/338023
My solution was to use the bootpd package instead. (apt-get install bootpd) Configuration is a bit more complex but still easy:
Put this in /etc/bootptab:
dbox:hd=/tftpboot:bf=ppcboot:ha=00509c:ip=192.168.0.99:sa=192.168.0.21:sm=255.255.255.0The ha=00509c is your dbox's MAC address, ip= is the IP-address of the dbox, sa= is the tftp server's address.