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An interestingly frustrating network issue

Submitted by douglas.w.needham on Wed, 02/25/2026 - 00:00

In setting up my CI/CD pipeline for some demo Docker containers recently, I ran into a frustrating, yet puzzling issue while trying to get Docker Swarm working. Indeed, it left me like "Johnny" Number 5 from the movie Short Circuit with questions, queries, and posers.

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This site is locally hosted on a dedicated bastion host running as a hardware virtualized machine. The physical host is a Dell R720 with dual Intel(R) Xeon(R) CPU E5-2690 @ 2.90 GHz processors (16 cores/32 total cores) and 256GB of RAM, with a 1Gbps/256Mbps dedicated GPON circuit with 3 static IPs. The virtual machine runs with 4 cores and 2GB of RAM with a LAPP stack, while a separate development host runs on another virtual machine with 2 cores and 2GB of RAM with a LEPP stack.

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