If you're running a small business with more than one computer, routers are usually a necessity. Routers provide small businesses with added security, a link between computer systems and extra ...

Yesterday, I noticed some really strange traffic coming from our mailserver. It was trying to connect to a loopback address (in the IANA space assigned for them, 127.0.0.0/8) on port 25. <BR><BR>I ...

Confusion over how to handle requests for 0.0.0.0 has exposed a security vulnerability in multiple browsers. Attackers could use this method to bypass Private Network Access protection. Google’s got a ...

Unix sysadmins routinely use the “ifconfig -a” command to list network parameters associated with their systems. In particular, they use this command to determine the IP address, netmask and broadcast ...

Although IPv6 adoption seems to be moving at a snail's pace, there's no outrunning it. Brien Posey demystifies some of the addressing issues many admins are still trying to figure out. [Editor’s note: ...