you did not see any messages probably because they were not enabled:
diag deb enable
prior to starting the application debug. Check that the DHCP server is actually running by connecting your notebook to the LAN, you should see the negotiations.
To pinpoint that one IP address usage you could run the sniffer which will show you every conversation to and from that IP address:
diag deb ena
diag sniffer packet internal 'host 220.127.116.11' 6
Now you can see
- if the address is in use
- find out by which device using the arp table
- if not in use, see how it gets assigned to the host and if it is used afterwards
Stop the sniffer by hitting Ctrl-C.
"Kernel panic: Aiee, killing interrupt handler!"