Linux – Page 8 – POFTUT

Category: Linux

0

How To Check If Port Is Open In Linux?

I have some servers and I want to check which ports is open. Open ports give clue about the load and security about the system. Open ports mean there is services running on the server and clients are using these so the load of this system is generally higher than other servers. Open ports can be used by attackers. Also open ports will prevent services use same port like Nginx...

0

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 install Gns3 to the Fedora 64 bit. Get Gns3 Installation...

0

How To Exclude Hosts From Nmap Scan?

Nmap is very useful tool for network administration and security. It is most used tool in these areas. But a lot of people use it with very basic means. Here we will look more sophisticated usage of nmap step by step in this ant further posts. Target Hosts Create a text file and add hosts/networks to it and then use this file with nmap. You can use network blocks like...

0

How To Discover Network Hosts With Nmap?

Hi. We started with nmap target specification. Now we resume with host discovery options.Host discovery is detecting hosts in the same or remote network. Generally we send a packet to the target host and then we get a response or not but some times we just listen and get packets from hosts. We decide host status according to response if we get it. There are some different ways to send...

0

Introduction To Squid

Hi today we will look most famous proxy in the world. Yes you guest it right it is squid. Proxy is an intermediate system that manages communication between two systems. In web applications http proxy is mostly used type. The client makes request to the proxy and then proxy makes the request to the server behalf of the client. So we may think that why we need intermediary system for...

1

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 mechanisms like selinux, apparmor should give permission. Captured data is...

0

How To Install and Use SNMP On Linux Tutorial with Examples?

Today we will look SNMP in Linux operating systems. Simple network management protocol named snmp is designed for getting info and setting configuration in it entities. These entities may be switch, router, pc, cabinet, printer etc. Snmp was very popular in 2000s. today it is popular too but used for information gathering. Especially monitoring which will be examined later is made today with snmp. Snmp has an index database which...

0

Introduction To Scapy Network Packet Generator

Scapy is a tool for network protocol, package generation and manipulation and showing them in a visual way with graphics and 3D images. There are tools equivalent like hping3 but scapy is very flexible against it. Scapy can manipulate all data of general protocols like IP, Ethernet, tcp, udp etc. If you have a network protocol scenerio you can implement it with scapy and python scripting. I advise to read...

0

How To Find External or Wan IP Address Without Browser?

Sometimes I need external IP address of system I am logged on. The general solution is to use browser and search for “what is my address” . And magically google shows the external IP. But if you have no chance to use browser or especially GUI there must be an alternative for this. Here is  a practical solution for this. Using text based browser with simple URL gives the correct...

0

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 hold resolved dns queries in our dns server. There are...

Enjoy this blog? Please spread the word :)