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Google Profile will display a "Send a message" link if you check the "Allow people to connect to me (without showing my email address)" check box when setting up your profile.
Her...
If you want to check whether a certain string represents a valid IPv4 address in 255.255.255.255 notation, try one of these examples from Regular Expressions Cookbook:
Simple regex to check fo...
If you have some servers or other machines to which you want to assign static IP addresses, you can use /etc/hosts, but it's a bit of bother to edit /etc/hosts on each of the zillion PCs you'r...
Install and configure dhcp. You can get the source tarball from http://www.isc.org. RPMs and Debian packages are also available; just look for packages named "dhcp." Configure client PCs to ...