internal_listener_proxy.yaml

# This configuration listens on port 9999 and creates TCP connections to port 10000 using an
# intermediate internal listener.
bootstrap_extensions:
- name: envoy.bootstrap.internal_listener
  typed_config:
    "@type": type.googleapis.com/envoy.extensions.bootstrap.internal_listener.v3.InternalListener
static_resources:
  listeners:
  - name: ingress
    address:
      socket_address:
        protocol: TCP
        address: 127.0.0.1
        port_value: 9999
    filter_chains:
    - filters:
      - name: tcp
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy
          stat_prefix: ingress
          cluster: encap_cluster
  - name: encap
    internal_listener: {}
    filter_chains:
    - filters:
      - name: tcp
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy
          stat_prefix: encap
          cluster: cluster_0
  clusters:
  - name: encap_cluster
    load_assignment:
      cluster_name: encap_cluster
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              envoy_internal_address:
                server_listener_name: encap
  - name: cluster_0
    load_assignment:
      cluster_name: cluster_0
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: 127.0.0.1
                port_value: 10000