Didja miss me? Didja? Didja?
Oh, OK then. If anyone still remembers me, hello again, if not hello anyway 
Prolly won't be quite as active as before.
Hmmm anyone do more development on the DHCP/DNS thingy?
Not knowing what you are on about, I ask that you give details.
Weedpharma
Quite a long time ago (years), there was a program someone put up using the wiznet ethernet board that partially handled network comms with the arduino as a server. I was able to improve DHCP and partially add DNS lookup so you could find the server by name instead of dotted quad. I had the arduino spitting out basic live webpages allowing you to read inputs and set outputs.
I dropped out because I got to busy with other things (stuff wot puts food on the table).
Yes DHCP & DNS have been implemented.
Source folder: https://github.com/arduino/Arduino/tree/master/libraries/Ethernet/src
Example using DNS: https://github.com/arduino/Arduino/blob/master/libraries/Ethernet/examples/WebClient/WebClient.ino
Example using DHCP: https://github.com/arduino/Arduino/blob/master/libraries/Ethernet/examples/DhcpAddressPrinter/DhcpAddressPrinter.ino