OS X 10.6.8 direct IP translation and DNS issues
Arpanet: At Work Since 1969 - editing your own hosts file is the method of choice.

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1   localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost


->

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
192.168.10.100  someweirdname.com www.someweirdname.com
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0     localhost


You might have to flush the DNS cache using sudo killall -HUP mDNSResponder and sudo dscacheutil -flushcache.