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troubleshooting Question

Cisco ASA 5510 blocking internal traffic

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I am trying to understand the ASA. I have seen two ASAs, a 5505 and a 5510, that block traffic when there are multiple subnets behind the internal interface. For example, the internal interface of the ASA is configured for There is another router ( on the subnet that acts as a gateway to another subnet, It is possible to ping between subnets, but all other traffic fails. Why would this be? What information can I provide? All help is greatly appreciated.
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