LAN Information Server

I've got LISa set up on a server that also allows others to connect
to it. On the same server, I'm also running a DHCP and a DNS
server. When a client uses DHCP, the hostname it specifies is
added to the zone file. I can ping these hosts fine using their
hostname, but LISa somehow doesn't use them when displaying
all computers, while the hostnames of computers with a static ip
(and defined manually in the zone file) do work correctly. It shows
me the IP instead.
What should I do to fix this problem? Thanks in advance.