This month, we shift our focus to an important security issue. We will combine some information about IP addresses, the TCP three-way handshake, and the role of the firewall. This security issue is ...

The procedure that takes place between two TCP/IP nodes to establish a connection. Known as the "SYN, SYN-ACK, ACK handshake," computer A transmits a SYNchronize packet to computer B, which sends back ...

Building a resilient IP network requires more than just putting in duplicate devices and turning on every feature available. A network manager must understand how those relevant protocols work, the ...

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 ...

When I use the netstat command to look at the open TCP/IP connections on my PC, there are connections that should be closed that are in the TIME_WAIT state. What is this, and why do connections stay ...