Categories

Apache 21

Articles on Apache webserver & other information for your knowledge.

cPanel 24

cPanel tweaks, tips & other instructions to manage your cpanel based VPS servers you have with us.

Exim 11

Anything & everything about exim MTA & administrative commands

Articles

 DHCP (Dynamic Host Configuration Protocol)

DHCP (Dynamic Host Configuration Protocol) is a network management protocol used to dynamically...

 Gateway or Router

Gateway / Router IP: All the clients on a network point to a default gateway that should be used...

 Linux Group Management (Collection of Users)

Groups are a collection of users. Assigning users to groups makes it easier to manage...

 Linux User Management

Following document will help you understand adding new users, groups and change ACL lists in your...

 MAC Address and ARP Protocol

MAC Address (size of address in binary 48bit): A Media Access Control address (MAC address) of a...

 Network Port Numbers and its Definition

A network port is a number that identifies one side of a connection between two computers....

 Network Switches, Routers & Internet Connection

Router vs Switch...

 Understanding DNS Servers

Root Servers: Root server -- these servers are at the base of the name server hierarchy. They...

 Understanding Firewall Structures in a Linux Server

CentOS has an extremely powerful firewall built in, commonly referred to as iptables, but more...

 Understanding IP addresses and Classes

IP Addresses: An IP address, short for Internet Protocol address, is an identifying number for a...

 Understanding Networking and Subnets

Network & Hosts: IP addresses are typically made of two separate components: 1. The first...

 Understanding Swapfile and setting up Swap for a System

Swap is space on a disk that is reserved to be used as virtual memory. When a Linux server runs...

 Useful Network Commands

netstat - Print network connections, routing tables, interface statistics, masquerade...

 tcpdump Command and Usage

tcpdump is a most powerful and widely used command-line packets sniffer or package analyzer tool...

 Understanding Email Services

MUA: Mail User Agent (email client): The MUA is the front-end for the end user to manage and read...

 Understanding POP, IMAP, Dovecot

Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with...

 Installing Exim on Cent OS 6.x / 7.x

Operating System: Cent os 6.x / 7.xHostname: hostname [not a registered domain name, but you can...

 Introduction of Exim MTA

Exim is a mail transfer agent (MTA) for hosts that are running Unix or Unix-like operating...

 Exim Config and Log path

The exim is an open source email server and it has a lot of flexible options and commands to...

 Understanding and Reading an Exim Maillog

Reading exim log can be a confusing or complicated at first, however, having understanding of...

 Handling Exim Spam Queue

As we see huge number of emails in a queue, first we need to find top senders, to do so, we can...

 Exim Shell Commands

Exim's command line takes the standard Unix form of a sequence of options, each starting with a...