Top Linux Networking Commands: The 2026 Field Reference
Every Linux networking command that matters, grouped by the question it answers, with real captures from a four-hop lab and the triage order to run them in.
Networking
Vendor-neutral fundamentals that apply no matter whose box you are logged into. Addressing, encapsulation, the OSI layers in practice, and why the packet went where it did.
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nmcli and nmtui: Managing Connections from the CLI
Devices against connection profiles, the activation step everybody forgets, and how to make a configuration survive a reboot.
ethtool: Link Speed, Duplex, Offloads, NIC Stats
The driver layer below the kernel: link settings, offloads that make packet captures disagree with the wire, rings, and where host-side drops show up.
ifconfig, route, netstat: Legacy net-tools to iproute2
The full command map, and the same host through both toolsets so you can see exactly what the legacy tools hide from you.
The Linux ip Command: The Complete Guide
The grammar, the four objects you use every day, the output modifiers that make it readable, and how to create interfaces out of nothing.
VXLAN EVPN Troubleshooting: What Actually Breaks
Four faults hit in a real Nexus fabric, the output that identified them, and an ordered method for the next one.
EVPN L3VNI and the Distributed Anycast Gateway
Symmetric IRB routes between VNIs on the leaf that receives the packet. Here is the L3VNI build and the real output that proves it worked.
A Real VXLAN Packet, Header by Header
A genuine VXLAN packet captured between a spine and a leaf, taken apart byte by byte from the outer MAC down to the ICMP echo request inside.
Ingress Replication vs PIM Anycast RP in VXLAN
BUM traffic still has to get everywhere in a VXLAN fabric. Here is how ingress replication handles it, and what you give up by not running PIM.
Spine-Leaf Underlay with OSPF on Nexus
A spine-leaf underlay should be the least interesting part of your fabric. Here is the OSPF build that gets you there, with real Nexus output.
vPC Failure Modes: Peer-Link, Keepalive, Type-1
The vPC failure matrix, with the Type-1 mismatch demonstrated on real hardware and the peer-link and keepalive rows explained rather than faked.
vPC Explained: Build It and Read Its Health
A real NX-OS vPC build with the warnings it emits, the health output decoded field by field, and an honest look at orphan ports.