Clear DNS lookup / IP address cache on OS X Tiger
lookupd -flushcache
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Check DNS lookup in Tiger
lookupd -configuration
Look for the following in the output:
LookupOrder: Cache FF DNS NI DS _config_name: Host Configuration
The FF (flat file) refers to your hosts file (/etc/hosts), and Tiger does check its contents before going to DNS and Netinfo. Just a little FYI for those who may not have realized that 10.4 fixed things.