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network-troubleshooting

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A structured and beginner-friendly guide to the fundamentals of computer networking covering everything from IP addressing, subnetting, routing, and protocols to network security and troubleshooting.

  • Updated Apr 16, 2026
  • JavaScript

iPerf3 Test Suite v2.0 is a powerful network performance analysis tool featuring 71 pre‑built iPerf3 commands across 7 categories (Bandwidth, TCP, UDP, Wi‑Fi, Latency, Infrastructure, Advanced). For authorised network troubleshooting, ISP verification, VPN testing, and capacity planning. 🚀

  • Updated Aug 22, 2026
  • Python

Fix PPPoE error 651 on GPON fiber: packet-level diagnostics. 116-tool read-only PowerShell toolkit (tshark + Npcap) sweeps 802.1Q VLAN 1-4094, decodes PADI/PADO/PADR/PADS discovery, reads ONU optical power, proves 'no PADO' is evidence, and pinpoints missing OLT-side OMCI GEM / T-CONT / VLAN provisioning on a Huawei HG8310M ONT. 22/22 self-test.

  • Updated Aug 26, 2026
  • PowerShell

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