iptables

• To flow iptable nat packets and get the source IP or domain host, you can use the following command:

iptables -t nat -A POSTROUTING -j LOG --log-prefix "NAT packet: " --log-level 4

• describe the source IP and domain

  
  This will log all NAT packets with a prefix of "NAT packet:" and a log level of 4. You can then check the system logs (usually found in /var/log/messages or /var/log/syslog) to see the logged information, which should include the source IP or domain host.

- To monitor the network policy hit log for pods in Google Kubernetes Engine (GKE), you can follow these steps:

- Enable network policy logging by creating a new ConfigMap with the following settings:
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: kube-system/network-policy-logging
  namespace: kube-system
data:
  loglevel: "5"

• Apply the ConfigMap to your cluster using the command:
• kubectl apply -f

• Verify that network policy logging is enabled by running the command: gcloud container clusters describe --zone= and checking that the networkPolicyConfig field has the enabled attribute set to true.

View the network policy hit logs by querying the Stackdriver Logging API using the command: gcloud logging read "resource.type=k8s_container AND resource.labels.cluster_name= AND resource.labels.namespace_name= AND resource.labels.pod_name= AND jsonPayload.event.reason=NetworkPolicyMatch" --limit= This will return a list of logs indicating which network policies matched and affected the pod. You can

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