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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.
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When the Fix Becomes the Failure: ECMP, Zone Protection, and a 64KB Ceiling
Three ECMP firewall cutovers went cleanly. The fourth did not — and the cause turned out to be Palo Alto MSS clamping, hidden inside a zone protection profile that had passed through three clean rollouts undetected. It was the highest…
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BGP Prefix Leak, RPKI, and the Cold Email That Confirmed It
A BGP route leak at an Internet2 customer site propagated more-specific prefixes into the global table, causing every major CDN to black-hole return traffic to an entire campus network. Diagnosing it required a cold email to a Google network engineer…