Archive for September, 2018

In this article i am going to show you how to create Digital certificate using openssl command line tool.we will also learn how to generate 4096 bit Private key using RSA Algorithm and we will also learn how to create self signed ROOT CA Certificate through which we will provide an Identity for ROOT CA.
We will learn how to generate an another 4096 bit Private key which will be used to generate our subordinate CA which will used for actual signing.

We will also learn how to request a certificate for subordinate CA. We will also also learn how to decode certificates on your own computer, run this OpenSSL command.

I will show you how to check a certificate and key before applying them to your server.We will learn to Check the SSL key and verify the consistency.

We will also learn how to Check a certificate and return information about it (signing authority, expiration date, etc.).

Also see how to Verify the CSR and print CSR data filled in when generating the CSR.



In this tutorial i will show you how to configure DNS server in Linux. We will learn to configure zone file and reverse lookup zone file.We will also learn about dns packages and dns services.We will also learn to change the ownership of files which we need to change.I have used Virtualbox for configuring and testing this DNS lab.The operating system i used for DNS server is RHEL5 and the DNS Client machines is WindowsXP.

Learn More server configuration on Linux.

DHCP SERVER Configuration in Linux.

NIS Server Configuration on Linux.

Apache server Configuration on Linux


The ip address for DNS server is and domain name is


DHCP Server configuration in Redhat Enterprise Linux. In this tutorial we will learn how to configure DHCP Server on Linux.Then we will see how dhcp client machine will receive ip address from DHCP server.

Subnet and netmask should be

Gateway Should be

DNS Sever Should be

Domain Name will be

Range from

DNS Configuration on Linux.
NIS Server Configuration on Linux.
Apache Web server Configuration on Linux.

So let’s assign IP Address, defaultĀ  Gateway IP and domain Name and range as we have decided above.