How Secure can Secure Shell (SSH) be? (OpenSSH VPN tunnelling)

How Secure can Secure Shell (SSH) be? (OpenSSH VPN tunnelling)

This article is the third part of the series on OpenSSH and configurations and includes tricks which make using the protocol more secure. This article concentrates on Virtual Private Networks supported by OpenSSH. VPN as Virtual Private Network is a set of protocols...

Basic Unix Queuing Techniques

It occasionally happens that our incoming or outgoing data cannot be processed as it is generated or, for some reason, we choose to process it at a later time. A typical example might be a client-server system, where it is necessary to queue the socket descriptors of...

Dynamic Memory Allocation in Unix Systems

It is not always possible, at compile time, to know how big to make all of our data structures. When we send an SQL query to the database, it may return twenty million rows, or it may return one. The mechanism by which we persuade the operating system to give us...

Nmap: How to Use it

Nmap stands for “Network Mapper”. It’s been seen in many films like the Matrix Reloaded, Bourne Ultimatum, Die Hard 4, etc. When Nmap was created, it could only be used on the Linux Platform but now it supports all the major OSes like Linux, UNIX, Windows, and Mac OS...
How Secure can Secure Shell (SSH) be? (OpenSSH VPN tunnelling)

FreeBSD Programming Primer – Part 11

In the penultimate part of our series on programming, we will look at using the Netbeans Integrated Development Environment to debug and edit our CMS. Unfortunately, the Internet gremlins have got me at the moment so this how-to is going to be very short. My local...
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