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Synthetic source example: 5 exported files, checked 2026-09-09.

See what a firewall rule change actually permits.

Compare supported Cisco ASA IPv4 access lists offline. Find unreachable rules and concrete packet examples whose permit or deny result changes.

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What this produces

Parsed rule table, reachability witnesses, changed-decision witnesses and an HTML analysis.

Input: One access list and an optional baseline using the documented explicit-address subset.

Supported scope: No device connection, traffic scan or configuration changes. Objects, NAT and stateful behavior are outside this model.

Full format and limits · Cisco access-list documentation

Build your result

Use the synthetic example or load your own supported files. Inputs stay in this browser. The first run downloads the processing engine. Keep your original files.

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Paid hosted orders are unavailable. No payment is requested. The browser workflow above is free; review its supported limits before relying on an export.