alias the ips...
ifconfig lo0 inet 127.0.0.100 netmask 255.255.255.0 alias
ifconfig lo0 inet 127.0.0.110 netmask 255.255.255.0 alias
ifconfig lo0 inet 127.0.0.120 netmask 255.255.255.0 alias
ifconfig lo0 inet 127.0.0.200 netmask 255.255.255.0 alias
ifconfig lo0 inet 127.0.0.210 netmask 255.255.255.0 alias
ifconfig lo0 inet 127.0.0.220 netmask 255.255.255.0 alias