What is ARP? Understanding Address Resolution Protocol Basics (Simple Guide)
When two devices on a local network need to communicate, they don’t rely solely on IP addresses—they … Read more
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Linux Networking
Check Internet Connection Using a Bash Script
For automation, cron jobs, or IoT devices, you often need to verify internet connectivity before continuing. Here are three bash methods to do it.
Maximize Network Performance: Measure Throughput Effectively with Netperf
Network throughput is a critical metric that determines the efficiency of your network infrastructure. It helps you … Read more
How Wi-Fi Devices Communicate with Access Points: A Complete Guide to Initial Handshakes
Wi-Fi has become an indispensable part of our daily lives, connecting our devices seamlessly to the internet. … Read more
Identify all devices in a network using nmap and ARP scan
What is Nmap? Nmap (Network Mapper) is a free and open-source network scanning tool. It is widely … Read more
How to Find MAC Address using IP Address ?
If you know the IP address of the Host, but its not within your physical reach but … Read more
Understanding wireless beacon packet ( captured using pcap API’s )
As per Wikipedia, Beacon frame is one of the management frames in IEEE 802.11 based WLANs. It contains all the … Read more
How to disable and / or enable ICMP ping from Linux host ?
To disable the ICMP ping from certain Linux host, lets say which has IP of 192.168.0.100 use … Read more
Discover mDNS and DNS-SD Services on Linux
Use mdns-scan for a quick inventory of DNS-SD service types, then use Avahi to resolve actual instances, hosts, ports, and TXT metadata. This guide also explains the multicast boundary and why discovery commonly fails across Wi-Fi isolation, VLANs, containers, and firewalls.
Identify IP Address’s of all devices in a network
Sometimes someone from within your network starts consuming lot of bandwidth and you just needed to identify … Read more
Identify which process keeps port busy on android / Linux
Lets say you are trying to do something with UPNP which reserves port 1900 for all of … Read more
C program to read mac address using WiFi interface name
If you need to get the mac address of certain wifi interface using C program, you can … Read more
Send and Receive (Transfer) integer over socket using C program
Following the simple example which shows how we can send and receive an integer over a socket. … Read more
Understanding pcap file format – part I – Global Header
The file must begin with a Section Header Block. Below is typical configuration, with a single Section Header … Read more
Sending ARP request and receiving ARP Reply using C code
This post is in continuation of our previous post “Understanding ARP (Address Resolution Protocol) basics“ To visualise … Read more
Querying Network Interface Details by Name in Go (net.InterfaceByName)
Write a Go program using net.InterfaceByName to lookup IP addresses, MAC hardware addresses, MTU, and status flags for a specific network interface.
Inspecting Linux Network Interfaces, MACs, and IP Addresses in Go
Learn how to enumerate network interfaces, inspect MAC addresses, extract IPv4/IPv6 CIDR subnets, and check interface status flags using Go.
Capturing Wi-Fi Raw Packets in C via AF_PACKET Raw Sockets on wlan0
Write a C packet sniffer in Linux using AF_PACKET raw sockets to capture, decode, and analyze Ethernet, IP, TCP, and UDP frames on wlan0.
Capture and analyze network packets using tcpdump and tshark
We can use tcpdump to capture the packets whereas tshark to analyse the packets. Using above help, … Read more
Sniffex – C program to Capture wifi packets using libpcap
libpcap provides functions for user-level packet capture, used in low-level network monitoring. Following program captures the packets … Read more
Shell script for switching wifi channel using hopping
Using the below script we tries to connect to different wifi channels of hotspot using iwconfig command. … Read more
Sending HTTP POST Data from a Client and Returning Server Responses via Netcat
Send HTTP POST data from client tools (curl, Python) and return custom JSON responses using Netcat over a specific port on Linux.
Bi-Directional Communication Between User-Space and Linux Kernel via Netlink Sockets
Learn bi-directional user-space to Linux kernel communication using Netlink sockets (AF_NETLINK) with full C kernel module and user client examples.
Listening on Specific Port Numbers with Netcat to Receive HTTP POST Requests
Listen on a specific port using Netcat (nc) to inspect incoming HTTP POST messages, webhooks, JSON payloads, and log headers in Linux.