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OpenSUSE

IPTraf - Console based IP Traffic Monitor in openSUSE

Post date: March 3, 2009, 05:03 Category: Network Views: 7331 Comments
Tutorial quote: IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts. IPTraf is an IP traffic monitor that shows information on the IP traffic passing over your network.
Linux

The Serial Console

Post date: April 14, 2005, 13:04 Category: Hardware Views: 3904 Comments
Tutorial quote: In these modern times, a hardworking admin might be tempted to turn her back on the Old Ways, and indulge in increasingly exotic methods of interfacing with servers: SSH over ethernet, USB, Firewire, wireless, infrared, KVM switches, VNC, VPN... next stop: direct neural implants.

There's one old timer that still has useful place in the admin's tool kit: the serial console. Sure, it's slow and funky. But there are times it can be a real lifesaver. When nothing else works, it's a direct pipeline into your system. It's simple and cheap. You don't need to install drivers or expansion cards, it's just there.

Administration via serial console is common in data centers. Just imagine the nightmare of trying to connect all those rack units to keyboards and displays. The cabling can be extended to a nice comfortable ops center (well, an ops center, anyway). (This Lantronix Console Manager is an example of the type of device used to administer these.)

There are a number of ways to make the physical connection. You can connect an external modem--the kind us old timers fondly refer to as "real" modems--and do remote administration via dialup. It couldn't be any simpler, just dial direct. Or grab a null modem cable, connect to a laptop or a nearby workstation, and you have an instant terminal.
Ubuntu

KVM Guest Management With Virt-Manager On Ubuntu 8.10

Post date: February 10, 2009, 12:02 Category: Miscellaneous Views: 5034 Comments
Tutorial quote: Virt-Manager (Virtual Machine Manager) is a graphical interface for managing KVM and Xen guests on the local and also on remote systems. You can use it to start, stop, pause, create, and delete guests, and you can connect to the guests using the graphical console. This guide shows how you can use it to manage KVM guests on an Ubuntu 8.10 desktop.
Linux

Filesystem snapshots with unionfs

Post date: July 2, 2005, 01:07 Category: System Views: 3444 Comments
Tutorial quote: Many times, you need to know how a certain filesystem looked like at some point in time, and you want to be able to roll back changes that happened to it after that point. While there are multiple solutions to achieve this goal, certainly one of them is to use filesystem snapshots.
BSD

Firewalling with OpenBSD's PF packet filter

Post date: April 19, 2005, 02:04 Category: Network Views: 7751 Comments
Tutorial quote: PF operates in a world which consists of packets, protocols, connections and ports.

Based on where a packet is coming from or where it's going, which protocol, connection of port it is designated for, PF is able to determine where to lead the packet, or decide if it is to be let through at all.

It's equally possible to direct network traffic based on packet contents, usually referred to as application level filtering, but this is not the kind of thing PF does. We will come back later to some cases where PF will hand off these kinds of tasks to other software, but first let us deal with some basics.

We've already mentioned the firewall concept. One important feature of PF and similar software, perhaps the most important feature, is that it is able to identify and block traffic which is you do not want to let into your local network or let out to the world outside. At some point the term 'firewall' was coined.
Ubuntu

How to install Subsonic in Ubuntu Hardy

Post date: September 23, 2008, 21:09 Category: Software Views: 4431 Comments
Tutorial quote: Subsonic is a free, web-based media streamer, providing access to your entire music collection wherever you are. Use it to share your music with friends, or to listen to your own music while at work. You can stream to multiple players simultaneously, for instance to one player in your kitchen and another in your living room.
Unix+clones

KMail In Depth

Post date: April 13, 2005, 20:04 Category: Software Views: 3185 Comments
Tutorial quote: KMail has long been my Linux email client of choice for a number of reasons: nice clean interface, easily customizable and configurable, stable, and more features than you can shake a stick at. Today we'll dig into migrating from other email clients, encrypting messages and key signing, and configuring multiple accounts and identities.
Debian

Interested in securely sharing a secret?

Post date: September 17, 2006, 08:09 Category: Security Views: 3543 Comments
Tutorial quote: I needed a method for sharing a secret that required multiple agents to coordinate before the secret could be recovered. This is useful for encrypting keys used in critical backups. I decided to use an implementation of Shamir's Secret Splitting Scheme (The S in RSA).

Currently I'm using a program called 'ssss' to do secret sharing.
Debian

Using the 'snort' Intrusion Detection System

Post date: December 27, 2005, 15:12 Category: Security Views: 5431 Comments
Tutorial quote: Snort is the leading open source Network Intrusion Detection System and is a valuable addition to the security framework at any site. Even if you are employing lots of preventative measures, such as firewalling, patching, etc., a detection system can give you an assurance that your defences truly are effective, or if not, will give you valuable information about what you need to improve.

Fortunately, there is a good set of snort packages for Debian which takes a lot of the tedious work out of building a useful Network Intrusion Detection System. Before we start on installation, we should review a few details about the networking satack that you're going to need to make sense of the alerts snort will generate. Impatient readers and those who are familiar with the TCP/IP suite of protocols may do now skip to the bit that says Stand alone snort.
Debian

Full Mail Server Solution With Virtual Domains & Users (Debian Etch, Postfix, MySQL, DoveCot, DSpam, ClamAV, Postgrey, RBL)

Post date: October 31, 2007, 09:10 Category: Installing Views: 4676 Comments
Tutorial quote: This guide describes how to set up a full email solution in Debian Linux (all code is from Debian Etch). I was asked to design a secure, scalable, portable solution for a small company. While the guide references many servers, the company only had 4 physical machines, Xen was used to virtualize the entire solution. That particular aspect of the system is not discussed in this guide, although I will try to get it into the next revision.
Web-based applications and online marketing solutions - LumoLink