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Configuring a VPN Kill Switch with nftables on Linux: Completely Prevent IP and DNS Leaks

By IT From Zero November 4, 2026

Configure a VPN Kill Switch with nftables on Linux to lock down network traffic when a VPN drops. A detailed guide to writing rules that prevent IP and DNS leaks at the kernel level.

Network

Installing and Optimizing Suricata on Linux: A Battle-Tested Guide to Deploying IDS/IPS

By IT From Zero October 31, 2026

A battle-tested comparison of Snort, Zeek, and Suricata under heavy traffic. Step-by-step guide to deploying Suricata IDS/IPS on Linux, tuning AF_PACKET ring buffers, and blocking threats in real time.

Network

Deploying RPKI with Routinator on Linux: BGP Route Origin Validation (ROV) to Prevent BGP Hijacking

By IT From Zero October 29, 2026

A step-by-step guide to installing Routinator on Linux for RPKI Route Origin Validation (ROV), enabling routers to automatically drop BGP-hijacked routes.

Network

Configuring a PPPoE Server on Linux Using rp-pppoe for ISP Labs

By IT From Zero October 26, 2026

A guide to building an ISP-grade PPPoE server on Linux using rp-pppoe. Configure CHAP authentication, automatic IP allocation, and resolve MTU/MSS bottlenecks in network lab environments.

Network

How to Configure Host sFlow on Linux: Real-Time Network Traffic and KVM Monitoring

By IT From Zero October 26, 2026

Host sFlow is an ultra-lightweight network traffic and server metrics collection tool for Linux. This comprehensive guide covers installing hsflowd, configuring collectors, and monitoring both bare-metal servers and KVM virtual machines.

Network

Configuring BFD with FRRouting on Linux: Sub-Second Link Failure Detection for OSPF and BGP

By IT From Zero October 24, 2026

Configuring BFD on FRRouting enables OSPF and BGP on Linux to detect silent link failures in 300ms, preventing traffic blackholing when the physical link stays up.

Network

How to Install AdGuard Home on Linux: Block Ads Network-Wide and Secure Your Home Network

By IT From Zero October 17, 2026

A complete guide to installing AdGuard Home on Linux. Learn how to resolve systemd-resolved port 53 conflicts, set up encrypted upstream DoH/DoT, and secure your home network.

Network

Optimizing Latency and Eliminating Bufferbloat on Linux with CAKE and FQ-CoDel

By IT From Zero October 15, 2026

Ping spikes under heavy network load are caused by Bufferbloat. This guide compares FQ-CoDel and CAKE, providing detailed Linux tc configuration steps to stabilize latency and eliminate congestion.

Network

A Guide to tcpreplay on Linux: Capture, Modify, and Replay Packets to Test Firewalls and IDS/IPS

By IT From Zero October 14, 2026

A practical guide to using tcpreplay and tcprewrite on Linux to replay pcap files, rewrite packet headers, and benchmark or validate Firewalls, Snort, and Suricata.

Network

How to Configure conntrackd with Keepalived on Linux: Seamless Firewall Session Synchronization

By IT From Zero October 14, 2026

Configure conntrackd alongside Keepalived to synchronize Linux conntrack tables for seamless firewall failover, preserving active TCP and SSH sessions without drops.