Transmission Control is an essential aspect of network activity and governs the behavior of many services we take for granted. When sending your emails or just browsing the web you are relying on TCP ...

Most network people understand the terrible effect delay can have on TCP sessions. TCP must pause data transfers while waiting for ACKs. The more network delay there is, the longer this pause will be.

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 ...

In the last Video Networking column, I described some of the headaches involved with trying to upload a file to an e-mail Web server. Most likely, Transmission Control Protocol (more commonly known as ...

One of the features of Wireshark that you may have noticed, if you’ve been reading my posts this week and doing some experimenting on your own, is that the program color-codes packets in the packet ...

Often we discuss errored packets that are dropped without understanding the underlying techniques that determine why the packets are discarded. There are checks for errors at several protocol layers.

In this article, we take a look at how SELinux can help increase the security of networked systems, as well as the design and implementation of its network-specific security controls. We then walk ...