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 ...

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 ...

In its second IOS security bulletin in a week, Cisco warned that a common management protocol used on the Internet could be used to launch denial-of-service attacks against Cisco routers and other ...

We’ll go out on a limb and assume that anyone reading these words is probably familiar with the classic ping command. Depending on which operating system you worship the options might be slightly ...

Recently, I noticed that there has been a surge in ICMP packets between some of my Active Directory controllers and Exchange servers. Virus scanning proved that the servers were clean. Is there any ...

Apple seems to be continuing to tweak the network stack of macOS 15 Sequoia and introducing fresh bugs in the process: After installing the latest version 15.3, third-party network tools are no longer ...