I added a second network port to my home server, and it fixed more than transfer speeds
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Adding a second PCIe network card to a home server delivers benefits well beyond raw speed. A Mellanox ConnectX-4 with a 25 GbE port was purchased primarily for future-proofing, but the real gains came from network segmentation: a dedicated management VLAN prevents lockouts during misconfigurations, a separate storage network isolates latency-sensitive iSCSI/NFS/SMB traffic from QoS policies affecting client devices, and additional ports enable link aggregation, VM isolation, and high-availability setups. The author argues that redundancy, traffic isolation, and operational flexibility are the most compelling reasons to add a second NIC to a home server.
