Cisco ASA Field Reference - Free 9-Page Cheat Sheet

Cisco ASA has a lot of moving parts. Three NAT sections that evaluate in a non-obvious order. ACLs that reference real or pre-NAT IPs (post-8.3) instead of the public ones you remember. A packet pipeline that has six phases before the packet ever reaches the egress interface. Inspection engines hidden behind a default global policy that nobody told you was there. The PingLabz Cisco ASA Field Reference condenses every command and pattern that matters into nine printable pages so you can stop scrolling docs at 2am.

What's inside

• Page 1 - Quick Reference. Security-level table, CLI modes, save commands, the eight golden rules to memorize, and the single most important troubleshooting command on the platform.
• Page 2 - Per-Packet Pipeline. Visual flowchart of every phase a packet walks through (Conn lookup, UN-NAT, ACL, NAT, Route, Inspection, Egress) plus the diagnostic order when a flow is failing.
• Page 3 - Configuration Patterns. Paste-ready code blocks for three-zone routed mode, 802.1Q subinterface trunks, network objects + object-groups, SSH hardening, and day-0 logging + NTP.
• Page 4 - NAT 8.3+ Cheat Sheet. Section 1 vs 2 vs 3 evaluation order, dynamic PAT, static NAT, single-port forwards, twice NAT for VPN exemption, with real show nat detail output annotated.
• Page 5 - Troubleshooting Decision Tree. Six symptom branches (no Internet from inside, no inbound to DMZ, NAT wrong rule, ACL not matching, VPN tunnel down, packet-tracer says ALLOW but real fails) - each with the most likely cause and the single command that confirms it.
• Page 6 - Verification + Debug Reference. Every useful show command grouped by purpose: system, interfaces, routing, ACL/NAT/conn/xlate, drops/logs/VPN, plus the canonical packet capture workflow.
• Page 7 - Reading the show Output (Annotated). Real captures from a live ASAv 9.23 lab: show access-list, show nat detail, show asp drop frame - each with a field-by-field guide to what is worth your attention.
• Page 8 - Lab Reference Topology. Standard PingLabz IP scheme diagram (inside, DMZ, outside, NAT pool, S2S peer) used in every capture across the cluster.
• Page 9 - Copy-Paste Templates + Change Checklists. Full three-zone config you can paste against a fresh ASA, plus the pre-change capture and post-change verification commands every team should run.

Print-friendly, code-block dense, and built around real lab captures from the PingLabz ASA Reference Lab. Engineers print these and tape them to their monitor.

Get the PDF

The download is free. You just need a PingLabz account, which is free to create and takes about ten seconds. No card required, no spam, just an email so we can let you know when the next cluster reference is ready.