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 ...

When we began this series, we discussed the ICMP (Internet Control Message Protocol). This protocol is the basis for two widely used applications, ping and traceroute. In this lesson and the next, we ...

At a time when the size of distributed denial-of-service attacks has reached unprecedented levels, researchers have found a new attack technique in the wild that allows a single laptop to take down ...

Researchers say BlackNurse attacks are low bandwidth (18Mbps) and can still knock offline many of today’s firewalls. A type of denial of service attack relevant in the 1990s has resurfaced with ...

Researchers warned that a low-volume BlackNurse DoS attack launched via a single laptop can bring some firewalls to their knees An attacker doesn’t need an IoT botnet or massive resources for a denial ...

At a time when the size of distributed denial-of-service attacks has reached unprecedented levels, researchers have found a new attack technique in the wild that allows a single laptop to take down ...