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https://www.cisco.com/web/services/news/ts_newsletter/tech/chalktalk/archives/200903.html
Support of the Asymmetric routing feature The Asymmetric routing (ASR) feature is supported in both the FWSM 3.x and ASA 7.x code releases, and can be leveraged in the firewalls in active/standby and active/active modes. This feature aligns the firewalls with the Layer-3 …
https://community.cisco.com/t5/firewalls/asa-asymmetric-routing/td-p/2421572
I believe I am seeing an asymmetric routing issue but not so sure. ASA version 9.1(1) We have the management interface (management-only configured) connected to an upstream router. Management default route out is towards this router ( and also its IP gateway) We also have the inside interface (dif...
https://community.cisco.com/t5/security-documents/asa-asymmetric-routing-troubleshooting-and-mitigation/ta-p/3117045
Introduction This document provides the basic procedures for identifying, understanding, and mitigating asymmetric routing issues in networks that are protected by the Cisco Adaptive Security Appliance (ASA). The ASA protects the network by denying traffic unless it can inspect both sides of t...
https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/111986-asa-tcp-bypass-00.html
May 19, 2010 · This image provides an example of asymmetric routing, where the outbound traffic goes through a different ASA than the inbound traffic: Note: TCP state bypass feature is disabled by default on the Cisco ASA 5500 Series Adaptive Security Appliances. Support Information. This section provides the support information for the TCP state bypass feature.
https://learningnetwork.cisco.com/thread/95351
Mar 08, 2016 · There is another possibility to solve this issue (even if i would try to avoid this kind of configuration whenever possible). You may configure interfaces inside and sophoslab to be in the same asr-group, so the ASA will be able to do stateful inspection even …
https://www.code426.com/knowledge-base/asa-asymmetric-routing-troubleshooting-and-mitigation/
Summary. The ASA protects the network by blocking traffic flows unless it is able to inspect the entire (both sides) of the connection. Using tools such as packet captures and syslogs, the ASA can also be a useful troubleshooting tool in identifying asymmetric routing problems.
http://help.sonicwall.com/help/sw/eng/7820/26/2/4/content/High_Availability.120.07.html
Asymmetric Routing . SonicOS 6.2.4.0 introduces support for asymmetric routing. Asymmetric routing is when the flow of packets in one direction passes through a different interface than …
https://www.experts-exchange.com/questions/27024704/Cisco-ASA-Possible-Asymmetric-Routing.html
As the ASA has a default route point to vlan 5 interface; not sure if that may be the cause of routing/stateful inspection issue. I have attachd a reference diagram below for reference ASA ----(vlan 4 and 5 trunk)------layer 3 switch
https://tools.cisco.com/security/center/resources/unicast_reverse_path_forwarding
Although asymmetric traffic flows may be of concern when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain asymmetric routing paths. Unicast RPF in an Enterprise Network. In many enterprise environments, it is necessary to use a combination of strict mode and loose mode Unicast RPF.
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