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System DB variable 'tm.monitorencap' controls whether the server monitor traffic is encapsulated inside DSR tunnel. If it is set to 'enable', monitor traffic is encapsulated, and return traffic is without the tunnel encapsulation. In such a case, the return traffic is not mapped to the original monitor flow, and gets rejected/lost.
Monitor traffic gets lost, and server pool is marked down.
System DB variable 'tm.monitorencap' is set to 'enable', and DSR server pool is monitored.
None.
The DSR tunnel flow now sets the correct underlying network interface, so that the return monitor flow can match the originating flow, which results in the DSR monitor working as expected.
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