OS X Lion Macports
OS X Lion Macports, Can I upgrade from Snow Leopard? With the new release of Apple Mac OS X Lion, there are a lot of changes on the kernel and backends. Therefore I don’t think it’s possible to do port…
How to Change MySQL Data Directory in Linux Centos
By default Linux CentOS or other Linux Distro installation, MySQL data directory is stored in /var/db/mysql, how can I change it to other directory in example /db/mysql? It is always better to have MySQL Data Directory store in a specific…
How to Find Your Closest Anycast DNS Server with Dig
Most ISP deploys Anycast DNS server on their network and bring the closest DNS server to their user for DNS resolver. You may see a DNS server with a single IP Address but there are multiple DNS Servers running on…
Exim: Restrict Authenticated Outgoing Email with Sender Domain
Most of the outgoing SMTP server allowed the user to set different sender email address once it is authenticated. But we might be in risk for allowing the user to send outgoing bulk/spam email via authenticated SMTP with different sender…
Detect DDoS Source & Destination IP Address with OURMON
We have OURMON running on one of network segment for quite some time, it is very helpful and resourceful when DDoS attack happened, especially to help our customer to find out which destination is targeted on the attack and from…
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