Category: networking

How To : Set up a FTPS (FTP over SSL) Server on Linux ~ Your Own Linux..!

FTP is a standardized network protocol and probably the quickest as well as easiest option available when a large chunk of data is to be transferred, from one host to another, over a TCP-based network. FTP defines a client-server architecture which uses two separate ‘well-known’ ports, for data (port no. 20, used for data transfer) and control (port no. 21, used for authentication) connections, in order to establish connectivity between the server and the client.

Source: How To : Set up a FTPS (FTP over SSL) Server on Linux ~ Your Own Linux..!

Improve Your Security: Check Your Router Hasn’t Been Hijacked | Gizmo’s Freeware

DNS, or the Domain Name System, is the part of the internet that converts www.techsupportalert.com (which you can understand but which your browser can’t), into an IP address of 72.52.134.16 (which your browser can understand, but which you probably don’t want to).

Source: Improve Your Security: Check Your Router Hasn’t Been Hijacked | Gizmo’s Freeware

Link: Introduction to Samba – Share Files and Directories between Linux, Windows and Mac

Samba is the most popular and efficient way with which you can share your files and directories between Linux, Windows and Mac. You just have to create a Samba user, Decide which file/directory you wish to share and Set the permissions, in order to create a Samba share. Well, initially, this might seem to be difficult- especially for beginners, but when you understand all the configuration options, it will seem to be as simple as anything.

This tutorial will explain how to share files and directories on Linux with Windows and Mac clients.

Full article here:
Introduction to Samba – Share Files and Directories between Linux, Windows and Mac (Your Own Linux..!)

Link: How to access a Linux server behind NAT via reverse SSH tunnel

You are running a Linux server at home, which is behind a NAT router or restrictive firewall. Now you want to SSH to the home server while you are away from home. How would you set that up? SSH port forwarding will certainly be an option. However, port forwarding can become tricky if you are dealing with multiple nested NAT environment. Besides, it can be interfered with under various ISP-specific conditions, such as restrictive ISP firewalls which block forwarded ports, or carrier-grade NAT which shares IPv4 addresses among users.

What is Reverse SSH Tunneling?

One alternative to SSH port forwarding is reverse SSH tunneling. …..

Full article here:
How to access a Linux server behind NAT via reverse SSH tunnel (Xmodulo)

Link: OpenVPN-Setup: Shell script to set up Raspberry Pi (TM) as an OpenVPN server

About

Shell script to set up Raspberry Pi (TM) as a VPN server using the free, open-source OpenVPN software. Includes templates of the necessary configuration files for easy editing, as well as a script for easily generating client .ovpn profiles after setting up the server. Based on the ReadWrite tutorial ‘Building A Raspberry Pi VPN’ by Lauren Orsini (see sources 1 and 2 at the bottom of this Readme).

To follow this guide, you will need to have a Raspberry Pi Model B or later (so long as it has an ethernet port), an SD or microSD card (depending on the model) with Raspbian installed, a power adapter appropriate to the power needs of your model, and an ethernet cable to connect your Pi to your router or gateway. You will also need to setup your Pi with a static IP address (see either source 3 or 4) and have your router forward port 1194 (varies by model & manufacturer; consult your router manufacturer’s documentation to do this). You should also find your Pi’s local IP address on your network and the public IP address of your network and write them down before beginning. Enabling SSH on your Pi is also highly recommended, so that you can run a very compact headless server without a monitor or keyboard and be able to access it even more conveniently (This is also covered by source 4). And last but not least, be sure to change your user password from the default.

Full documentation and download here:
OpenVPN-Setup (GitHub)
Discussion in this Reddit thread

Link: DIY Time Capsule with a Raspberry Pi

As a Mac user I’ve always used Time Machine for local backups. The only issue is that it requires plugging a drive directly into your machine or buying an Apple Time Capsule. At $200 – $400 that’s not a cheap option for NAS backups.

So I set out to create my own DIY Time Capsule using a 3TB Hard Drive and a Raspberry Pi. Below are the steps I went through to get things setup.

Note: I always recommend having multiple backup sources and because this setup requires mimicking Apple protocol there is potential for data loss. Use at your own risk.

Full article here:
DIY Time Capsule with a Raspberry Pi (Caleb Woods)

Link: How To Install And Configure Squid Proxy On Ubuntu And Debian

Squid Proxy is  a a great proxy server mainly used for caching frequently requested web content in order to speed up response time and also save network bandwidth. It supports many different protocols such as HTTP, FTP, TLS, SSL, Internet Gopher and HTTPS. Although it was originally designed to run as a daemon on Unix-like systems there have been several ports to windows, but according to wikipedia more current versions are not being developed.

Squid Proxy is released under the GNU General Public License.

In this tutorial you will learn how to install and setup Squid Proxy on Ubuntu and Debian Linux distributions. Just follow each step of this guide carefully and everything will be ok.

Full article here:
How To Install And Configure Squid Proxy On Ubuntu And Debian (Unixmen)

Link: Deprecated Linux networking commands and their replacements

In my article detailing the command line utilities available for configuring and troubleshooting network properties on Windows and Linux, I mentioned some Linux tools that, while still included and functional in many Linux distributions, are actually considered deprecated and therefore should be phased out in favor of more modern replacements.

Specifically, the deprecated Linux networking commands in question are: arp, ifconfig, iptunnel, iwconfig, nameif, netstat, and route. …..

Full article here:
Deprecated Linux networking commands and their replacements (Doug Vitale Tech Blog)

Link: Easily Find Out Which Process Is Using Too Much Bandwidth in Linux

While there are many network monitoring tools available for Linux, most of them monitor network traffic to and from your computer or a particular interface. However, there are times when you want to nail down a particular process that’s using up too much of the bandwidth, and there is a tool, dubbed NetHogs, that lets you do just that.

In this article, we will discuss the basics of NetHogs as well as the features it provides.

Full article here:
Easily Find Out Which Process Is Using Too Much Bandwidth in Linux (Make Tech Easier)

Link: Top 30 Nmap Command Examples For Sys/Network Admins

Nmap is short for Network Mapper. It is an open source security tool for network exploration, security scanning and auditing. However, nmap command comes with lots of options that can make the utility more robust and difficult to follow for new users.

The purpose of this post is to introduce a user to the nmap command line tool to scan a host and/or network, so to find out the possible vulnerable points in the hosts. You will also learn how to use Nmap for offensive and defensive purposes.

Full article here:
Top 30 Nmap Command Examples For Sys/Network Admins (nixCraft)