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Twitter, NYTimes and Huff Po Whois and DNS records altered, Syrian Electronic Army takes responsibility

Twitter, NYTimes and Huff Po Whois and DNS records altered, Syrian Electronic Army takes responsibility

August 28, 2013 · by Paul Ooi · in lost+found, Systems

At approximately 3pm PST, the Syrian Electronic Army seemingly hacked into Twitter, Huffington Post and NY Times’ registry accounts altering contact details, and more significantly, DNS records. Modifying DNS records of a domain will allow SEA to redirect visitors to…

How to Enable check_dns on Nagios Monitoring System

How to Enable check_dns on Nagios Monitoring System

February 25, 2011 · by Paul Ooi · in Application, Systems

Most user who are new to Nagios doesn’t know there is a hidden plug-in called check_dns in Nagios Monitoring system. On FreeBSD server, the binary can be found at /usr/local/libexec/nagios. List the directory and you should see check_dns. check_dns usage…

Free eBook: Alternative DNS Servers

Free eBook: Alternative DNS Servers

February 25, 2011 · by Paul Ooi · in Application, Systems

Grab this 747 pages DNS eBook for Free; Written by Jan-Piet Mens, titled “Alternative DNS Servers”. I glance through at the eBook and found several interesting topics for DNS deployments. Bind DLZ – The Bind extension which can store your…

Reverse DNS Lookup with Dig

January 22, 2011 · by Paul Ooi · in Systems

Reverse DNS, in simple explanation it means that resolve your IP address into hostname. Nowaday it became a must have requirement for mail server’s IP address. It is also one of the method to determine your mail server IP is…

Bind Error: “max open files (3520) is smaller than max sockets (4096)”

June 28, 2010 · by Paul Ooi · in Systems

Just notice one of the DNS server has the error message 28-Jun-2010 16:28:24.283 general: max open files (3520) is smaller than max sockets (4096) It’s something to do with kernel setting, on FreeBSD, configure the following shell> sysctl kern.maxfiles=4096 shell>…

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