- Linux Administrator's Security Guide - https://www.seifried.org/lasg/
A comprehensive security guide aimed at administrators and users, available online in Acrobat PDF format, by Kurt Seifried.
- Linux Firewall Howto - http://www.Linux-Sec.net
Firewall HOWTO collection, ids, nids, hardening, penetration testing, auditing
- Introduction to Linux Networking and Security - http://www.acm.org/crossroads/xrds6-1/linuxsec.html
Brief introduction to the IP networking services, how to configure them, and how to set up a relatively secure Linux workstation. Published in ACM Crossroads, the ACM student magazine.
- YoLinux: Internet Server Security HowTo and Tutorial - http://yolinux.com/TUTORIALS/LinuxTutorialInternetSecurity.html
This tutorial covers the installation and use of hacker protection software such as Portsentry, tripwire, ssh. It also covers configuration and administration steps to make a Linux server secure against hackers.
- Linuxs security basics - http://www.itworld.com/Man/3872/lw-01-security/
How to achieve the goal of every system admin: boring, predictable computers
- Rusty's Remarkably Unreliable Guides - http://www.samba.org/netfilter/unreliable-guides/
Netfilter project provides HOWTOs for packet filtering, NAT and netfilter code hacking for Linux.
- Securing NIS - http://www.eng.auburn.edu/users/doug/nis.html
Provides a checklist on how to secure UNIX/Linux NIS (formerly YP) services in an intranet environment.
- Setting up a secure Linux server - http://www.fiveanddime.net/ss/secureserver.html
Setting up a secure Linux server using RedHat and the Linux From Scratch system.
- Linux Security White Papers - http://www.ists.dartmouth.edu/IRIA/knowledge_base/
A small collection of Linux security white papers and other information resources. The papers cover secure shell (ssh), host security, and firewalls.
- Network Security Information: UNIX - http://secinf.net/unix_security/
Network Security Library has links to many UNIX (and, especially, Linux) security articles on host hardening, security admin guides, and special purpose hardening tips.
- UnOfficial SELinux FAQ - http://www.crypt.gen.nz/selinux/faq.html
A technical FAQ for the NSA SELinux project, which covers installation and implementation issues.
- Firewalling and Proxy Server HOWTO - http://en.tldp.org/HOWTO/Firewall-HOWTO.html
Teaches the basics of firewall systems and give you some detail on setting up both a filtering and proxy firewall on a Linux based PC, by Mark Grennan.
- Using Term to Pierce an Internet Firewall - http://en.tldp.org/HOWTO/Term-Firewall/
Tutorial on using 'term' to do network stuff through a TCP firewall that you're not supposed to be able to, by Barak Pearlmutter.
- Secure POP via SSH mini-HOWTO - http://en.tldp.org/HOWTO/Secure-POP+SSH.html
Explains how to set up secure POP connections using ssh, by Manish Singh.
- Linux Security HOWTO - http://en.tldp.org/HOWTO/Security-HOWTO/
Security issues that face the administrator, security philosophy, examples of how to secure the system from intruders.
- Linux IPCHAINS-HOWTO - http://en.tldp.org/HOWTO/IPCHAINS-HOWTO.html
Describes how to obtain, install and configure the enhanced IP firewalling chains software for Linux, and how they might be used, by Paul Russell.
- Linux Bridge+Firewall Mini-HOWTO - http://en.tldp.org/HOWTO/Bridge+Firewall.html
A tutorial on how to setup a bridge and a firewall with Linux, by Peter Breuer.
- Firewall Piercing mini-HOWTO - http://en.tldp.org/HOWTO/Firewall-Piercing/
Tutorial on using ppp over telnet to do network stuff transparently through an Internet firewall. (François-René Rideau)
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