## Redirection

As ztunnel aims to transparently encrypt and route users traffic, we need a mechanism to capture all traffic entering and leaving "mesh" pods.
This is a security critical task: if the ztunnel can be bypassed, authorization policies can be bypassed.

Redirection must meet these requirements:
* All traffic *egressing* a pod in the mesh should be redirected to the node-local ztunnel on port 15001.

Next steps:
  * Deploy a Gateway: https://istio.io/latest/docs/setup/additional-setup/gateway/
  * Try out our tasks to get started on common configurations:
    * https://istio.io/latest/docs/tasks/traffic-management
    * https://istio.io/latest/docs/tasks/security/
    * https://istio.io/latest/docs/tasks/policy-enforcement/
  * Review the list of actively supported releases, CVE publications and our hardening guide:

# * Lower resource utilization.
# * Some additional features are enabled by default; especially ones used in some tasks in istio.io.
# * More ports enabled on the ingress, which is used in some tasks.
meshConfig:
  accessLogFile: /dev/stdout
  extensionProviders:
    - name: otel
      envoyOtelAls:
        service: opentelemetry-collector.observability.svc.cluster.local

      #     Redirect only selected ports:            --includeInboundPorts="80,8080"
      excludeInboundPorts: ""
      includeInboundPorts: "*"

      # istio egress capture allowlist
      # https://istio.io/docs/tasks/traffic-management/egress.html#calling-external-services-directly
      # example: includeIPRanges: "172.30.0.0/16,172.20.0.0/16"
      # would only capture egress traffic on those two IP Ranges, all other outbound traffic would

		inpodMarkRule := netlink.NewRule()
		inpodMarkRule.Family = family
		inpodMarkRule.Table = RouteTableInbound
		inpodMarkRule.Mark = InpodTProxyMark
		inpodMarkRule.Mask = InpodTProxyMask
		inpodMarkRule.Priority = 32764
		rules = append(rules, inpodMarkRule)
	}

	for _, rule := range rules {
		log.Debugf("Iterating netlink rule : %+v", rule)
		if err := f(rule); err != nil {

# * Lower resource utilization.
# * Some additional features are enabled by default; especially ones used in some tasks in istio.io.
# * More ports enabled on the ingress, which is used in some tasks.
meshConfig:
  accessLogFile: /dev/stdout
  extensionProviders:
    - name: otel
      envoyOtelAls:
        service: opentelemetry-collector.observability.svc.cluster.local

# * Lower resource utilization.
# * Some additional features are enabled by default; especially ones used in some tasks in istio.io.
# * More ports enabled on the ingress, which is used in some tasks.
meshConfig:
  accessLogFile: /dev/stdout
  extensionProviders:
    - name: otel
      envoyOtelAls:
        service: opentelemetry-collector.observability.svc.cluster.local

# * Lower resource utilization.
# * Some additional features are enabled by default; especially ones used in some tasks in istio.io.
# * More ports enabled on the ingress, which is used in some tasks.
meshConfig:
  accessLogFile: /dev/stdout
  extensionProviders:
    - name: otel
      envoyOtelAls:
        service: opentelemetry-collector.observability.svc.cluster.local

- [readiness probes](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/)
- [replica count](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/)
- [HorizontalPodAutoscaler](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/)

The install is organized in 'environments' - each environment consists of a set of components
in different namespaces that are configured to work together. Regardless of 'environment',
workloads can talk with each other and obey the Istio configuration resources, but each environment
can use different Istio versions and different configuration defaults.