The purpose of this tutorial is to introduce some OpenVPN basics. We will be configuring an OpenVPN server running on Linux, and then one client that has all it’s traffic re-directed through the tunnel. This may be useful to some…
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Blog Archives
OpenVPN Basics
Dial on Demand Backup Link
The purpose of this short tutorial is to show you how to configure a dial on demand backup link on a Cisco router. For the purposes of the article the hardware used was a Cisco 1720 (12.3(26)) and a WIC…
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Reflexive access-lists on a Cisco router
Reflexive access-lists are one of the methods that can help us achieve full firewall functionality with a Cisco router. Setting up the access-lists I always tend to call my router/firewall access-lists the same thing, one called inside_out, and one called…
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BIND – preparing for DNSSEC
“The Domain Name System Security Extensions (DNSSEC) is a suite of Internet Engineering Task Force (IETF) specifications for securing certain kinds of information provided by the Domain Name System (DNS) as used on Internet Protocol (IP) networks. It is a…
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How to configure simple HSRP
The purpose of this short tutorial is to show you how to configure a simple redundant HSRP link between two Cisco routers. For the purposes of the article the hardware used was two Cisco 7200 (12.4(23b)) routers. Initial setup I…
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Calculate Google PageRank from PHP
Google is the single most important search engine in the world today, practically all web users will use Google before any other search engines. A full fledged SEO industry is running on the google pagerank algorithm decided by Google Inc.…
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Client VPN – Juniper Netscreen and Shrew IPSEC Client
Introduction This guide provides instruction on how to set-up a Juniper Netscreen firewall via SSH or console to allow clients to connect using the shrew.net IPSEC client. Overview This configuration described below will allow an IPSEC VPN client to communicate…
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Remotely monitor server with Nagios using check_by_ssh
Nagios is a brilliant monitoring system that I’ve used for years. If you need to use Nagios to monitor remote servers, the usual method is to install a small client, NRPE (Nagios Remote Plugin Executor), on the remote server and…
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Configuring simple OSPF
The purpose of this short tutorial is to show you how to configure simple OSPF routing between two Cisco routers. For the purposes of the article the hardware used was two Cisco 3600 (12.3(14)) routers. Initial setup I am starting…
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Default edge access-list
What should you be filtering on your edge routers? Cisco provides the following template as a good start to securing your edge routers. I recommend you have a good read through this and implement as much as you can. !—…
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