There seems to be a problem when reconfiguring the IP: Windows machines don't find it any more.
I solved that problem, in another IP stack I participated in writing, by emiting a "Gratuitous ARP reply". It is very easy to implement and solves a lot of complicated problems.
I wish very much to see it implemented in a future version...
There a good explanation here <http://wiki.ethereal.com/Gratuitous_ARP>