• 29 June 2024

    • Fooling Port Scanners: Simulating Open Ports with eBPF and Rust

    Dive into the world of network security with this comprehensive guide on using eBPF and Rust to outsmart port scanners. This article explains the TCP three-way handshake, explores the popular Stealth SYN Scan technique, and demonstrates how to implement an eBPF program that simulates open ports.

    eBPFlinuxkernelrustfeatured
    26 minute read
    Fooling Port Scanners: Simulating Open Ports with eBPF and Rust
  • 21 June 2024

    • Networking and Sockets: Syn and Accept queue

    In this article, we delve into the mechanics of TCP connection management, focusing on the SYN queue and the accept queue. We explore backlog configurations, system parameters like net.core.somaxconn and net.ipv4.tcp_abort_on_overflow, and how they affect queue behavior.

    linuxrustsocketsnetworkfeatured
    16 minute read
    Networking and Sockets: Syn and Accept queue
  • 8 November 2023

    • Beginner's Guide to XDP: A Journey Through Crafting XDP-Based Firewall with BCC

    Step into the world of eBPF/XDP with this beginner's guide. Learn to build a simple SSH firewall, utilizing XDP's capabilities for secure, incoming network traffic management!

    eBPFlinuxkernelpythonfeatured
    27 minute read
    Beginner's Guide to XDP: A Journey Through Crafting XDP-Based Firewall with BCC
  • 27 October 2023

    • Beyond Observability: Modifying Syscall Behavior with eBPF - My Precious Secret Files

    This article dives into a subtle application of eBPF, extending beyond its conventional use for observability to demonstrate its capability to modify system call behavior, showcased through a simple application designed to safeguard our precious files.

    eBPFlinuxkernelpythonfeatured
    12 minute read
    Beyond Observability: Modifying Syscall Behavior with eBPF - My Precious Secret Files
  • 22 October 2023

    • IPv4 Socket Surveillance - Tracing using kprobe, kretprobe and maps with BCC

    Through a simple app, this post illustrates real-time monitoring of network activities triggered by syscalls, utilizing kprobe, kretprobe, and maps. It highlights the synergy between eBPF and these probing tools, showcasing a practical approach to understanding network operations.

    eBPFlinuxkernelpythonfeatured
    23 minute read
    IPv4 Socket Surveillance - Tracing using kprobe, kretprobe and maps with BCC
  • 14 October 2023

    • The beginning of my eBPF Journey - Kprobe Adventures with BCC

    Embark on a fascinating journey into the realm of eBPF programming through this blog post. We kickstart our exploration with Kprobe, a dynamic tracing tool in the Linux kernel, by delving into a simple 'Hello World' and other experiment using BCC.

    eBPFlinuxkernelpythonfeatured
    24 minute read
    The beginning of my eBPF Journey - Kprobe Adventures with BCC
  • 30 January 2023

    • Optimizing Large File Transfers in Linux with Go - An Exploration of TCP and Syscall

    Explore efficient large file transfers in Linux using Go, focusing on minimizing data copies and context switches via the sendfile syscall.

    golinuxsocketsnetworkfeatured
    11 minute read
    Optimizing Large File Transfers in Linux with Go - An Exploration of TCP and Syscall
  • 5 December 2022

    • Understanding Unix Domain Sockets in Golang

    Delve into the workings of Unix domain sockets in Golang, contrasting them with network sockets. Explore their creation, efficient inter-process communication on the same machine, and practical code examples demonstrating a simple echo server setup​.

    golinuxsocketsnetworkfeatured
    16 minute read
    Understanding Unix Domain Sockets in Golang
  • 21 August 2021

    • Socket sharding in Linux example with Go

    Uncover socket sharding in Linux using Go, enabling multiple sockets to bind to the same IP and port for enhanced load balancing. The article provides insights into setting the SO_REUSEPORT socket option, creating a ListenConfig instance in Go.

    linuxgosocketsfeatured
    7 minute read
    Socket sharding in Linux example with Go
  • 6 April 2020

    • How to setup simple load balancing with IPVS, demo with docker

    Explore setting up simple IPVS load balancing on Linux with a hands-on Docker demo, covering tool installation, virtual service creation, and verification.

    k8snetworklinuxfeatured
    6 minute read
    How to setup simple load balancing with IPVS, demo with docker
  • 29 October 2019

    • How BigCache avoids expensive GC cycles and speeds up concurrent access in Go

    Uncover how BigCache in Go alleviates expensive GC cycles and bolsters concurrent access, using sharding for data distribution and byte arrays to minimize GC interference, enhancing cache performance and application responsiveness.

    gofeatured
    8 minute read
    How BigCache avoids expensive GC cycles and speeds up concurrent access in Go
  • 21 July 2019

    • Implementation of Dijkstra using heap in Go

    Dive into implementing Dijkstra's Algorithm using a min-heap in Go, focusing on the creation of a priority queue to efficiently find the shortest path between nodes. The guide includes detailed code for heap and graph logic, demonstrating a practical approach to Dijkstra's Algorithm in Go.

    goalgorithmdata structurefeatured
    7 minute read
    Implementation of Dijkstra using heap in Go