Sorry for no update in the previous weeks.
I’v made some progress. mDNSResponder, which provides the underlying ZeroConf functionalities, has been ported to Haiku. It runs on Haiku correctly. In order to make it run, minor updates in our network stack were also applied.
This is a companion discussion topic for the original entry at https://www.haiku-os.org/blog/majie/2009-07-20_zeroconf_support_progress/