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FortiGate FortiOS CLI Troubleshooting: Cheat Sheet

FortiGate FortiOS CLI troubleshooting cheat sheet by symptom: flow trace and sniffer first, then WAD, SD-WAN, IPsec, FSSO, HA and CPU command flows.

admin 2026-08-25

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Linux Performance Troubleshooting: Tools and Commands

Troubleshoot Linux performance with the USE method: read load average correctly, then CPU with top/mpstat/perf, memory, disk I/O with iostat, network

admin 2026-08-25

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Ansible for Network Engineers: Complete Guide

Ansible for network engineers: agentless design, inventory and group vars, ios_facts, ios_config backups, Jinja2 roles, Vault secrets and scaling out.

admin 2026-08-25

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Ansible Cisco IOS First Playbook: Commands and VLANs

Ansible Cisco IOS-XE first playbook: venv install, ansible.cfg and group_vars, ios_command show runs, ios_vlans changes, idempotency, backups and libs

admin 2026-08-25

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SONiC Network OS Configuration with GNS3: Easy Guide

Build a free SONiC lab in GNS3: import the SONiC VS image, cable a Clos, manage ConfigDB and configure VLANs, PortChannels, RIFs and BGP with real CLI

admin 2026-08-25

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NetApp ONTAP Performance Monitoring Commands Guide

<p>ONTAP 9 performance commands: statistics show-periodic, sysstat -x and -M, statit, wafltop, qos statistics and a triage workflow for CPU, network o

admin 2026-08-25

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Mellanox InfiniBand Switch Setup: Enable Subnet Manager

Enable the InfiniBand subnet manager on a Mellanox SB7800: find the switch IP, start the SM via MLNX-OS CLI or web UI, and verify the fabric links.

admin 2026-08-25

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Junos BGP Establishment Troubleshooting: Commands

Troubleshoot Junos BGP session establishment: the state machine, show bgp neighbor error codes, TCP 179 filtering, auth and MTU faults, and traceoptio

admin 2026-08-25

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Juniper MC-LAG Best Practices: Configuration and Usage

Juniper MC-LAG best practices: ARP and MAC sync with arp-l2-validate, bootp DHCP relay, ICCP and ICL design, backup liveness and failure scenarios.

admin 2026-08-25

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Cisco Nexus 9000 Troubleshooting Cheat Sheet: Tools

Nexus 9000 troubleshooting cheat sheet: Ethanalyzer, SPAN, ELAM, Packet Tracer, ACL capture, OBFL and event-histories - matched to the symptom each so

admin 2026-08-25

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