Tag
icmp
- Feb 5, 2026 ICMP Errors as the Only Feedback Channel for Forwarding Which errors a router is allowed to generate, what it must quote back, and why rate limiting and filtering turn a diagnostic protocol into a silent failure mode. networking
- Jul 16, 2025 Fragmentation, the MTU Floor, and Path MTU Discovery Black Holes How a datagram is split into pieces that a smaller link can carry, why the reassembly rules create ambiguity, and the specific way discovery fails when ICMP is filtered. networking
- Dec 25, 2023 What ICMP Echo and TTL Probing Actually Measure The difference between the forward and return paths a traceroute samples, why hop times are often wrong, and what rate limiting on the control plane does to the numbers. networking