Sometimes you just need to change a handful of system settings on a machine and have no interest in starting over. A good example might be moving a web server to a new network where it has a new hostname. The box is just fine, but the IP and the hostname will need to change for it to function on the new network. For those situations, Solaris has a tool called sysunconfig that will walk you through the initial setup of your solaris machine. You’ll be able to change the hostname, IP, timezone, etc. As root run
sys-unconfig
Note that this will require a reboot when you’re done, so think ahead.