Setup a OpenVPN server on Centos 6

February 02, 2013 at 07:40 AM | categories: Sysadmin, Tips, Security, Centos | View Comments
OpenVPN 2 is available for Centos from the EPEL repository, so you need to have EPEL enabled. If you do not have EPEL enabled run: rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm To install OpenVPN run: yum install openvpn lzo -y...
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Centos 6 Bonded network interfaces

February 01, 2013 at 07:40 AM | categories: Sysadmin, Tips, Centos | View Comments
Bonding allows you to aggregate multiple ports, providing redundancy, fault tolerance and load balancing. There are various types of bonding available but i will show how to bond in mode 1 which is active-backup. If your interested in the other...
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How to update man keywords database

January 16, 2013 at 07:40 AM | categories: Centos, Ubuntu, Sysadmin, Unix, RHEL, Linux, Tips | View Comments
Man keywords database allow you to search for man pages using keywords, the database needs to be updated when ever man pages are added or removed. This is how you do it for various *nix types. mandb ...
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Strongswan now supports PAM authentication

November 07, 2012 at 07:40 AM | categories: Centos, Sysadmin, RHEL, Linux, Tips, Security, IPSEC | View Comments
Strongswan release 5.0.1 includes a XAuth PAM plugin which requests username/password XAuth credentials and verifies them against Pluggable Authentication Modules (PAM). This plugin is not enabled by default to enable it you need to add the following to your ./configure...
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Strongswan now supports Cisco unity extensions

November 07, 2012 at 07:40 AM | categories: Centos, Sysadmin, RHEL, Linux, Tips, Security, IPSEC | View Comments
I previously wrote about setting up split tunneling on Strongswan using the attr-sql plugin With the release of Strongswan 5.0.1 it is no longer the only way to support split tunneling. Strongswan 5.0.1 introduces the unity plugin which allows for...
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IPSEC split tunneling VPN with Mac OSX and Strongswan 5 on Centos/RHEL 6

September 01, 2012 at 10:08 AM | categories: Centos, Mac OS X, Howto, Sysadmin, RHEL, Linux, Tips, Security, IPSEC | View Comments
In my previous post i described how to setup an IPSEC VPN for use with Iphone, Ipad and Mac OSX IPSEC VPN clients. This post describes how to enable split tunneling which is supported by the Mac OSX IPSEC...
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Iphone/Ipad/Mac OSX IPSEC VPN with Strongswan 5 on Centos/RHEL 6

August 23, 2012 at 10:21 AM | categories: Centos, Mac OS X, Howto, Sysadmin, RHEL, Linux, Tips, Security, IPSEC | View Comments
This howto describes setting up an IPSEC VPN for use with the Iphone, Ipad and Mac OSX VPN clients on Centos/RHEL 6. I am using the 5.x branch of Strongswan which is now the mainline actively maintained branch. At...
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Fix Bind error (broken trust chain) resolving

August 22, 2012 at 08:21 PM | categories: Tips, RHEL, Centos, DNS, Linux | View Comments
This Bind named issue results in queries failing and log messages such as the following being logged error (no valid KEY) resolving 'dlv.isc.org/DNSKEY/IN': 156.154.101.23#53 error (broken trust chain) resolving './NS/IN': 193.0.14.129#53 The issue is caused by the date on...
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Setup DKIM on Postfix with OpenDKIM

April 29, 2012 at 06:50 AM | categories: Postfix, Howto, DKIM, Centos, Email | View Comments
DKIM is an authentication framework which stores public-keys in DNS and digitally signs emails on a domain basis. It was created as a result of merging Yahoo's domainkeys and Cisco's Identified Internet mail specification. It is defined in RFC...
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Setup DKIM on Postfix with dkim-milter

March 10, 2009 at 11:54 PM | categories: Postfix, Howto, DKIM, Centos, Email | View Comments
DKIM is an authentication framework which stores public-keys in DNS and digitally signs emails on a domain basis. It was created as a result of merging Yahoo's domainkeys and Cisco's Identified Internet mail specification. It is defined in RFC...
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Mail server setup with Exim, MySQL, Cyrus-Imapd, Horde webmail on Centos 5.1

March 04, 2009 at 12:37 PM | categories: Horde, Centos, Howto, Exim, Cyrus, Linux, Email | View Comments
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...
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Setup a Linux Playstation 3 media server (Centos 5.2)

January 25, 2009 at 03:00 PM | categories: Mediaplayer, PS3, Howto, Centos, DLNA | View Comments
The Sony Play station 3 is a DLNA compatible device, DLNA is a framework where home electronics can share digital media and content seamlessly. This tutorial is a followup to the previous howto on ubuntu. Given that i like...
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