As a Linux administrator, your first line of defense is to know what services are running on your system. It's your responsibility to check whether or not services are authorized, as well as to ...

This article examines netstat and some of it many outputs, in relation to the open systems interconnect (OSI) model. A quick examination of netstat's man pages provides a description of the program: ...

So I'm looking at the output of 'netstat -s -t' and I see the various TCP retransmit counters increase quite a bit. Particularly concerning is this counter: Tcp: 223726 active connections openings ...

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 ...