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The services hosted behind Istio service mesh has the sidecar proxy installed with each pod of the service. The communication between these is possible only when the TLS option is set to the "ISTIO_MUTUAL"
In the below diagram,
SERVER - httpbin (If TLS Mode is "SIMPLE", it will accept both traffic for tls and plain text. TLS Mode must be ISTIO_MUTUAL for talking to other istio clients. MUTUAL when talking to other external services) istio service which use different rootca
CLIENTS - sleep (TLS Mode can be "SIMPLE" (for services with no sidecars) or ISTIO_MUTUAL(services with sidecars)). MUTUAL when talking to other external services) or istio service which use different rootca
Diagram
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NOTE - For this scenario, the default mesh wide policy must be set to "PERMISSIVE" on both the clusters. It will not work if the default Mesh Policy is "STRICT"
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