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Backups, New Features of pf, and Rootkit Protection

by chromatic
Linux Newsletter for 03/10/2003

Welcome to another Linux newsletter. Though the skies are overcast here on the west coast, the birds are out and about. Here's hoping you have decent weather to sit back and enjoy a few interesting articles.

Glenn Graham starts things off by exposing a dirty little secret about network backups. He likes to use cron and NFS to back up files and such to a central server. "What?", you might ask. "That simple?" Yes, and it works fairly well. Although there are lots of back-up solutions, both software and hardware, it illustrates a clever, Unixy way to administer your systems. Read more in Network Backups over NFS.

Jacek Artymiak thinks that pf has matured greatly since it replaced ipf in the OpenBSD 3.0 days. He's taking a voluminous look at the new and interesting features in his Securing Small Networks column. This week, he looks at setting up and Redirecting Traffic with NAT and pf.

Dru Lavigne laments the fact that putting a box on the Internet means you have to be paranoid about a few malicious people trying out their grab bag of exploits. Even though you're running Linux, FreeBSD, or OpenBSD, you still need to be vigilant. Learn how to protect yourself in Avoiding Rootkits and Trojans. Although she's looking at FreeBSD in particular, many techniques still apply.

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Join us again next week when your editor will happily admit to posting articles about Egoboo, PHP forms, and government-funded free software.

Until then,

Technical Editor
O'Reilly Network and Linux DevCenter Top Five Articles Last Week

  1. Testing SMP Kernel Modules with UML
    Code that works well on a single-processor box may fail spectacularly on a multiprocessor box. Until recently, the only way to test this was to use a two-, four-, or more-way machine. Not anymore! Jerry Cooperstein introduces UML (User Mode Linux) and demonstrates how to emulate a multiprocessor machine with it by testing kernel modules.

  2. NAT with pf
    OpenBSD's packet filter has really grown up. Since its introduction in OpenBSD 3.0, it has become an advanced tool for networking and security. In the first of four articles, Jacek Artymiak examines recent updates to pf. This week, he looks at Network Address Translation.

  3. Avoiding Trojans and Rootkits
    It's a sad reality that connecting to the Internet puts your computer at risk. Of course, there are several ways to mitigate that risk. Dru Lavigne explains a few good habits to reduce the danger and introduces tripwire, an open source file integrity utility.

  4. Using NFS for Networked Backups
    As mass storage prices continue to fall, making backups to a centralized server starts to look convenient. Of course, the mechanics of this situation can be tricky. Glenn Graham demonstrates a quick and easy solution using NFS.

  5. Running Samba on the Mac OS X Server
    Mac OS X Server differs from Mac OS X in how it deals with the configuration of Samba-based services. In this excerpt from Using Samba, 2nd Edition, learn how to set up SMB files and printer shares, enable client user access, and monitor activity, all on Mac OS X Server 10.

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