I’ve been using dhcpd on my centos box for a couple of weeks and every so often I check the dhcpd.leases file so see what’s connected, just coz I can. I’ve noticed that there are multiple entries in there for each IP, which while it’s not a problem for me, could be quite confusing. So I was looking for a way just to have one entry per IP address, and found this.
edit the dhcpd.conf file, add the fillowing line and restart the dhcp service
It seemed to work for me ok.