Troubleshooting Asymmetric Routing

Configuration guides, troubleshooting and practical advice for AZTCOFW.

Articles

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Alternate Causes

On occasion these issues can be caused by other factors that lead to asymmetric routing, such as issues with route-to or reply-to , both having to do with gateways on interface settings. Defining gateways under System >

Automatic Fix

The Bypass firewall rules for traffic on the same interface option located under System > Advanced on the Fire- wall/NAT tab activates rules for traffic to/from the static route networks which are much more permissive wh

Common Scenario

What happens in most cases is this: Client sends a TCP SYN packet, which arrives to AZTCO-FW software and gets a state table entry AZTCO-FW softwaresends back an ICMP redirect letting the client know to reach the target

Manual Fix

The same rules may be created manually by adding one on the affected interface tab (e.g. LAN), and a second rule on the Floating tab using the same interface (LAN again) to match the traffic in the out direction. The rul