DHCP problems with Mac OS X

Chased down an odd behaviour between ISC Dhcp (3.0.4 in my case) and some Mac OS X clients. You'd see the clients doing a DHCPDISCOVER, receive the DHCPOFFER from the server but no DHCPACK would ever show up in the logs. After some sniffing and some trial and error, we found the culprit:

server-identifier "srv01";

After changing it to:

server-name             "srv01.domain.lcl";

the Mac OS X clients started working again.