How to make static DNS in Mikrotik

Step 1 – Navigate to DNS. Step 2 – Set Allow Remote Requests. Step 3 – Click on Static. Step 4 – Click + and add Static DNS. Step 5 – Now open terminal and test Static DNS. When you ping mikrotik will redirect to This is very usefully when you want to […]

How to check for bad sectors Ubuntu (Linux)

I’ll be logged in as root. Step 1 – Show your HDD with the following command. fdisk -l Disk /dev/sda: 500.1 GB, 500106780160 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976771055 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 […]

How to prioritize voip traffic in Mikrotik

One of the many fantastic features provided by the Mikrotik RouterOS system is the ability to differentiate and independently prioritise traffic passing through the system based on a wide variety of criteria including source and destination address and port, traffic type and protocol, and even application. A common requirement taking advantage of this funtionality is […]

How to configure firewall and fail2ban for prevent “brute force attack” Zimbra 8.6 on Ubuntu (Server) 14.04 LTS Step-by-Step

Fail2ban is an intrusion prevention framework written in the Python programming language. It is able to run on POSIX systems that have an interface to a packet-control system or firewall installed locally for example, iptables or TCP Wrapper. Fail2ban operates by monitoring log files for selected entries and running scripts based on them. Most commonly […]

How to install Zimbra 8.6 on Ubuntu (Server) 14.04 LTS Step-by-Step

I’ll be logged in as root. You have to install: Install the prerequisite packages Configure server Configure DNS record Download and Install Zimbra Install the prerequisite packages: Step 1 – Update repositories. root@mail:/# apt-get update root@mail:/# apt-get upgrade Step 2 – Install the prerequisite packages root@mail:/# apt-get install libgmp10 libperl5.18 libaio1 unzip pax sysstat sqlite3 […]