Hardware
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Intel I226-V: Specs, Power, Errata and I225-V Compared
Intel I226-V specs from the datasheet: 1.3 W vs the I225-V's 1.95 W, EEE support, the I225 IPG bug, the I226 ASPM L1.2 stall and igc(4) support.
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N100 vs N305 vs N5105: Firewall CPU Comparison
Intel N100, Core i3-N305 and Celeron N5105 compared for OPNsense and pfSense: cores, cache, PCIe lanes, memory channels, power, and who each one suits.
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i226-V Link Drops: Fix 2.5GbE Flapping on OPNsense
Why Intel i226-V ports drop link on OPNsense and pfSense, and an ordered fix list: cabling, forced speed, ASPM, EEE, flow control and driver tunables.
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Intel N100 Firewall Build Guide: NICs, Throughput, Power
How to spec an Intel N100 firewall: i226 vs Realtek NICs, realistic OPNsense and pfSense throughput, RAM and storage sizing, and real power draw.