You are looking for "/Library/Preferences/VMware\ Fusion/vmnet8/dhcpd.conf" But range configuration in "DO NOT MODIFY SECTION". If you want to add static ip for specific machine you can add following:
host vmnet8 {
hardware ethernet 00:0c:29:09:b6:a7;
fixed-address 172.16.103.42;
option domain-name-servers 172.16.103.2;
option domain-name "";
option routers 172.16.103.2;
}
You can find hw address in network adapter settings. Ip address should be in your subnet defined in "/Library/Preferences/VMware\ Fusion/networking" file.