Postfix – Relay local mail to External Email Address | For good practice, one should receive root mail from your Linux server. Linux typically sends all sorts of important cron messages, alerts, logwatch emails, and other info to root@localhost.
I’ll show you how to use Postfix to relay this local mail to your own external email account such as a gmail account!
Use OpenDNS for Free Content Filtering | If you have little kids at home, or need to setup content filtering for schools, OpenDNS is free and works great. I’ll show you how it works! First, change the DNS servers in your router to 188.8.131.52 and 184.108.40.206. Next, go to opendns.com and create a free account. Once inside your account, you will need
How to install host, nslookup and other BIND tools on Windows | For a Linux admin using Windows, cygwin unfortunately does not provide host, nslookup, or other bind tools. I’ll show you how to download these BIND tools directly from ISC and have them work in your cygwin terminal! Note: this assumes you already have a working cygwin install. First, download the latest version of BIND for
Tunnel DNS through ssh -D socks proxy | When using ssh -D to setup a socks proxy, DNS queries and DNS traffic are not sent through the ssh tunnel. However, with Firefox a config change can be made to send DNS traffic through the ssh tunnel. Here’s how it works! First, establish an ssh proxy: $ ssh -D 9000 user@host Then in Firefox,
Use nmap to check DNS configuration best practices | A new NSE script in nmap 6.25 checks DNS zone configuration best practices. I’ll show you how it works! First, you will need nmap 6.25 (or later) installed: http://nmap.org/download.html Now with nmap 6.25 installed, run the below command against a DNS server. In this example, I am checking the configuration of the zone google.com from