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 ...

Today, researchers have disclosed their findings on a novel Windows malware sample that uses Internet Control Message Protocol (ICMP) for its command-and-control (C2) activities. Dubbed "Pingback," ...

The current IP address scheme of 32-bit words is fast becoming inadequate. It would appear that 2 32 = 4 294 967 296 combinations of addresses should be enough for everybody, but in practice this is ...

Hi everyone.<BR><BR>Recently, my firewall was caught with a bug that cause it to blacklist itself: when it encountered a packet with the "No not fragment" flag set too big to fit on the next hop, it ...

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 ...

Network tools are essential for solving issues with a computer network that is not performing as it should. There are quite a few things can do to aid in returning a network to its rightful state, and ...