Tag: Architecture
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Held the Line, Owned the Miss
An SE evaluating me for a role told me something about my own resume I’d never noticed. It carries more “held a technical position against management pressure, then was proven right” stories than any resume he’d reviewed, he said, and he called it an unclaimed sales instinct. I wrote about that on LinkedIn. This post…
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The Server That Never Talked: ARP TTL, FDB Aging, and a Broadcast Storm
An ARP TTL FDB aging mismatch turned a data center into a light show. Around 2005, every top-of-rack switch in the data center was blinking like a light show at a disco rave. I traced the cause back to a server doing exactly what its owner designed it to do. The failure wasn’t a misconfiguration,…
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1500 != 1500: MTU, OSPF ExStart, and a 14-Byte Blind Spot
What OSPF is actually doing when it stalls in EXSTART, why MTU is the non-obvious suspect, and what to check first when you hit it.