One of my users desktops is the recipient of an ICMP host unreachable packet at very odd times. 2100 and 0400, when no one was at the computer.<P>The sending gateway is in entirely different IP class, ...

So I recently upgraded my company's domain controller from Windows Server 2003 to Server 2008 R2. Naturally this resulted in a foray into IPv6, so I've spent some time delving into it and getting our ...

The ICMP protocol facilitates the use of important administrator utilities such as ping and traceroute, but it can also be manipulated by hackers to get a snapshot of your network. Learn what ICMP ...