Category: CCNP

How To Direct and Reverse Ip Look Up With Nslookup In Linux and Windows?

nslookup is a network tool using to query DNS to obtain domain name or IP address. The full name of nslookup is “name server lookup” . Nslookup supports interactive and batch mode. Nslookup alternative is dig which uses underlying Operating System libraries. Syntax Syntax is like below.

name is the domain name we want to use server is the DNS server

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What Is My DNS Server and Hot To Change DNS Server For Windows, Linux?

Dns Servers are very important part of the internet and computer networks. When DNS servers are down we can not use internet in a easy manner. DNS servers provides domain name to IP or vice versa resolution. Windows Windows operating system family provides ipconfig command for general information gathering tool. ipconfig command without any parameter will show base configuration about

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What Is A Dns Server?

Domain Name System is a system or concept used to name hosts connected to the network. DNS is hierarchical which means there is tree like connection in the domain names. DNS is invented by Paul Mockapetris in 1983. What is Domain Name Domain name identifies hosts connected to the network. Domain names are unique. For example www.poftut.com is a domain name. Here com is

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How To Install Gns3 To Fedora?

Gns3 very useful tool to simulate real networks and systems. In the first days of its Gns3 was simple Cisco IOS image emulator. But recent years its development has gained momentum. This made Gns3 a multi platform, flexible real world simulator. Gns3 supports systems like Cisco, Juniper, Palo Alto, Pfsense, Docker etc. In this tutorial we will look how to

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How Configure Cisco For Logging?

Hi, collecting logs are important. In my daily job I am working with logs about a lot of systems like WMware , Application ,Linux,windows,Cisco ,checkpoint, pfSense. Logs provides info about the system, application etc. Security incident management systems heavily rely on logs. Example Log Logs consist of date system name and event detail like

Here Aug  1 05:39:30.992 is date

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Tcpdump Tutorial With Examples

Tcpdump is packet sniffer for everyday use. There is lot of packet sniffers but tcpdump differs with his general availability and ease of use. Tcpdump use libcap library which is the core library used for packet sniffing. Here we will look general usage examples of packet sniffing. Be aware that to use tcpdump, tcpdump should have enough privilege and security

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Install Dnsmasq As Cache Dns Server

We have a lot of computer in our network. Our network speed is not too much. Sometimes especially in mornings our internet connection slows down. How can solve this with some dns related tricks? Dns is one of the mostly used network protocol. It can effect the internet speed. Making some optimizations will develop your internet experience. Caching is to

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