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Security Issues and Poptop
PPTP does not have the best history in terms of security. The original Microsoft implementation for PPTP faired very poorly. MS-CHAPV2 solved these weaknesses - for wired networks. Unfortunately, back in 2004, Joshua Wright released a version of ASLEAP capable of brute-force attacking PPTP passwords in a wireless environment. As a systems administrator for the VPN, you can't tell if a user is connecting via some public WiFi service where someone might be running a tool like ASLEAP. Yet, the presense of PPTP client software on Windows machines makes using PPTP very tempting. The best answer to this problem is to utilize two-factor authentication. If a one-time passcode is brute-forced, it won't matter as it can't be used again.
Server Monitoring With munin And monit On Mandriva 2008.0
In this article I will describe how you can monitor your Mandriva 2008.0 server with munin and monit. munin produces nifty little graphics about nearly every aspect of your server (load average, memory usage, CPU usage, MySQL throughput, eth0 traffic, etc.) without much configuration, whereas monit checks the availability of services like Apache, MySQL, Postfix and takes the appropriate action such as a restart if it finds a service is not behaving as expected. The combination of the two gives you full monitoring: graphics that lets you recognize current or upcoming problems (like "We need a bigger server soon, our load average is increasing rapidly."), and a watchdog that ensures the availability of the monitored services.
Automatically Add Disclaimers To Outgoing Emails With alterMIME On Fedora 8
This document describes how to install and configure alterMIME as a Postfix filter on a Fedora 8 system. The resulting system will automatically add disclaimers to outgoing emails.
How To Set Up Software RAID1 On A Running System (Incl. GRUB Configuration) (Mandriva 2008.0)
This guide explains how to set up software RAID1 on an already running Mandriva 2008.0 system. The GRUB bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one).
Connecting GPRS From Ubuntu Gutsy
Connecting to GPRS using a Nokia Phone is not too tough in Ubuntu Gutsy. This is because the default udev rules does install the required drivers and map most of the Nokia devices to /dev/ttyACM0. But it can become tough if you need to retain the resolv.conf or making the pppd to add a default route to the connected device. We will see how it was done properly in the Saturn Labs.
Network Diagnostic Tool (NDT) On Ubuntu 7.10 Server
This guide will walk you through the setup process for implementing NDT running under Ubuntu 7.10 server. For those unfamiliar with NDT, it is a network performance testing application. NDT will measure the throughput between your server and the desktops that you run the java client from.
Mail Server Setup With Exim, MySQL, Cyrus-Imapd, Horde Webmail On Centos 5.1
This how to describes the installation and configuration of a mail system on Centos 5.1 with selinux enabled for enhanced security. This system will be able to service HTTP, HTTPS, SMTP, TLS, SMTP-AUTH, IMAP, POP3 clients and is virtual enabled allowing more than one domain to be served from the system.
How To Check If Your Server Is Infected With The Linux/Rst-B Backdoor (Debian Etch)
Linux Rst-B is a backdoor that can be used to add your server to botnets (see http://www.heise.de/newsticker/meldung/103563 (in German)). This short guide explains how you can install and use the Sophos Linux/RST-B detection tool to check your Debian Etch server and find out if it is infected with Linux Rst-B.
Master-Master Replication With MySQL 5 On Fedora 8
This document describes how to set up master-master replication with MySQL 5 on Fedora 8. Since version 5, MySQL comes with built-in support for master-master replication, solving the problem that can happen with self-generated keys. In former MySQL versions, the problem with master-master replication was that conflicts arose immediately if node A and node B both inserted an auto-incrementing key on the same table. The advantages of master-master replication over the traditional master-slave replication are that you don't have to modify your applications to make write accesses only to the master, and that it is easier to provide high-availability because if the master fails, you still have the other master.
How To Set Up Software RAID1 On A Running System (Incl. GRUB Configuration) (Fedora 8)
This guide explains how to set up software RAID1 on an already running Fedora 8 system. The GRUB bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one).