On Lion or Mountain Lion, you use the following technique to reset the Administrators password: Boot to your Recovery Partition, by holding down the Option key while starting, and then selecting the Recovery HD as the boot choice. Once booted, at the top of the screen is a menu …, select Utilities / Terminal from
While tools like nmap are excellent for scanning for IPs (specifically ports) sometimes you have to take it to the next level in case you get very slow or erratic responses from hosts on your network. Using the ARP layer, you can check to see the actual MAC addresses that are responding to your requests.
Here is a simple guide in setting up an NTP Server in your Mac OS X. Although it does look trivial, it took me a while to figure it out (and find solutions out there). Steps 1 & 2 are important, as it does the trick. Disable the synchronizing of the local clock to ntp.