When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. This month, we shift our focus to an important security issue. We will combine some information ...

In our continuing discussion of TCP and selective retransmission of lost packets, we enlisted the help of Gary Kessler, an associate professor at Champlain College in Burlington, Vt., and our resident ...

Last week we discussed ports in some detail. This week, even more detail. To understand how ports work and the ways they behave, we need to understand how TCP/IP functions. Ports are numbered from one ...

On Thursday morning, Vint Cerf, the most famous member of the “fathers of the Internet” club (whose secret greeting is the TCP 3-Way handshake) testified before the House of Representatives Energy and ...

Part I of this article discussed tcpdump, a command-line utility that sniffs network traffic. Now let's see what it can do. Scenario 1: Established Telnet Connection Using tcpdump we can analyze the ...