Tag
ipv4
- Feb 27, 2026 The IPv4 Header Fields That Forwarding Rewrites Which of the twenty header bytes a router must read, which it decrements or recomputes in place, and where the header checksum stops protecting anything. networking
- Nov 4, 2024 Classful Addressing, Subnets, and the Move to CIDR Why the fixed class A, B, and C boundaries wasted most of the IPv4 space, how subnetting borrowed host bits, and what prefix aggregation changed about routing. computing history