Chaper 11.2.1 Queries about Nodeport when requesting one of node

[Bonjaski]

Environments

• Cluster version: v1.21.4
• Virtual Machine: Oracle VM
• CNI: Calico

Problem

Different results from the book.

''' Book '''
Did you also notice where the pod thought the request came from? Look at the Client IP at the end of the response. That’s not the IP of the computer from which I sent the request. You may have noticed that it’s the IP of the node I sent the request to. I explain why this is and how you can prevent it in section 11.2.3.
''''

[node info]

root@k8s-m:~# kubectl get nodes -o wide
NAME     STATUS   ROLES                  AGE   VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION     CONTAINER-RUNTIME
k8s-m    Ready    control-plane,master   86d   v1.21.4   192.168.100.10    <none>        Ubuntu 20.04.3 LTS   5.4.0-88-generic   docker://20.10.13
k8s-w1   Ready    <none>                 86d   v1.21.4   192.168.100.101   <none>        Ubuntu 20.04.3 LTS   5.4.0-88-generic   docker://20.10.13
k8s-w2   Ready    <none>                 86d   v1.21.4   192.168.100.102   <none>        Ubuntu 20.04.3 LTS   5.4.0-88-generic   docker://20.10.13
k8s-w3   Ready    <none>                 86d   v1.21.4   192.168.100.103   <none>        Ubuntu 20.04.3 LTS   5.4.0-88-generic   docker://20.10.13

[Request to nodes result]

# Requesting k8s-w1 node
$ curl 192.168.100.101:30080

==== REQUEST INFO
Request processed by Kiada 0.5 running in pod "kiada-001" on node "k8s-w1".
Pod hostname: kiada-001; Pod IP: 172.16.228.71; Node IP: 192.168.100.101; Client IP: ::ffff:10.0.2.15

==== REQUEST INFO
Request processed by Kiada 0.5 running in pod "kiada-003" on node "k8s-w2".
Pod hostname: kiada-003; Pod IP: 172.16.46.4; Node IP: 192.168.100.102; Client IP: ::ffff:172.16.228.64

==== REQUEST INFO
Request processed by Kiada 0.5 running in pod "kiada-canary" on node "k8s-w3".
Pod hostname: kiada-canary; Pod IP: 172.16.197.4; Node IP: 192.168.100.103; Client IP: ::ffff:172.16.228.64

According to the book, the result ClientIP should be the IP of the node I sent the request to. However, It's not the Node IP (192.168.100.10 * ) and I have no idea where these IP (10.0.2.15, 172.16.228.64, 172.16.228.64) came from..

and it's fixed value but no idea where it came from
"k8s-w1" ↔ 10.0.2.15
"k8s-w2" ↔ 172.16.228.64
"k8s-w3" ↔ 172.16.228.64

---

[All resource Information]

root@k8s-m:~# kubectl get all -A -o wide
NAMESPACE     NAME                                           READY   STATUS    RESTARTS   AGE   IP                NODE     NOMINATED NODE   READINESS GATES
default       pod/nginx                                      1/1     Running   0          21d   172.16.228.70     k8s-w1   <none>           <none>
john          pod/kiada-001                                  2/2     Running   0          8h    172.16.228.71     k8s-w1   <none>           <none>
john          pod/kiada-002                                  2/2     Running   0          8h    172.16.197.3      k8s-w3   <none>           <none>
john          pod/kiada-003                                  2/2     Running   0          8h    172.16.46.4       k8s-w2   <none>           <none>
john          pod/kiada-canary                               2/2     Running   0          8h    172.16.197.4      k8s-w3   <none>           <none>
john          pod/nginx                                      1/1     Running   0          22d   172.16.228.68     k8s-w1   <none>           <none>
john          pod/quiz                                       2/2     Running   0          23d   172.16.46.3       k8s-w2   <none>           <none>
john          pod/quote-001                                  2/2     Running   0          23d   172.16.46.1       k8s-w2   <none>           <none>
john          pod/quote-002                                  2/2     Running   0          23d   172.16.228.65     k8s-w1   <none>           <none>
john          pod/quote-003                                  2/2     Running   0          23d   172.16.197.2      k8s-w3   <none>           <none>
john          pod/quote-canary                               2/2     Running   0          23d   172.16.197.1      k8s-w3   <none>           <none>
kube-system   pod/calico-kube-controllers-6fd7b9848d-k7v4w   1/1     Running   0          86d   172.16.29.3       k8s-m    <none>           <none>
kube-system   pod/calico-node-nz65k                          1/1     Running   0          86d   192.168.100.102   k8s-w2   <none>           <none>
kube-system   pod/calico-node-pd9pt                          1/1     Running   0          86d   192.168.100.10    k8s-m    <none>           <none>
kube-system   pod/calico-node-w9rf5                          1/1     Running   0          86d   192.168.100.103   k8s-w3   <none>           <none>
kube-system   pod/calico-node-z82zf                          1/1     Running   0          86d   192.168.100.101   k8s-w1   <none>           <none>
kube-system   pod/coredns-558bd4d5db-d78qm                   1/1     Running   0          86d   172.16.29.1       k8s-m    <none>           <none>
kube-system   pod/coredns-558bd4d5db-kzpkt                   1/1     Running   0          86d   172.16.29.2       k8s-m    <none>           <none>
kube-system   pod/etcd-k8s-m                                 1/1     Running   0          86d   192.168.100.10    k8s-m    <none>           <none>
kube-system   pod/kube-apiserver-k8s-m                       1/1     Running   0          86d   192.168.100.10    k8s-m    <none>           <none>
kube-system   pod/kube-controller-manager-k8s-m              1/1     Running   7          86d   192.168.100.10    k8s-m    <none>           <none>
kube-system   pod/kube-proxy-h2c5v                           1/1     Running   0          86d   192.168.100.103   k8s-w3   <none>           <none>
kube-system   pod/kube-proxy-kt7kv                           1/1     Running   0          86d   192.168.100.102   k8s-w2   <none>           <none>
kube-system   pod/kube-proxy-qgpjp                           1/1     Running   0          86d   192.168.100.101   k8s-w1   <none>           <none>
kube-system   pod/kube-proxy-znxn4                           1/1     Running   0          86d   192.168.100.10    k8s-m    <none>           <none>
kube-system   pod/kube-scheduler-k8s-m                       1/1     Running   6          86d   192.168.100.10    k8s-m    <none>           <none>

NAMESPACE     NAME                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE   SELECTOR
default       service/kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP                      86d   <none>
default       service/my-service   ClusterIP   10.98.28.169     <none>        80/TCP                       22d   app=MyApp
john          service/kiada        NodePort    10.99.142.250    <none>        80:30080/TCP,443:30443/TCP   8h    app=kiada
john          service/quiz         ClusterIP   10.104.206.158   <none>        80/TCP                       23d   app=quiz
john          service/quote        ClusterIP   10.97.190.49     <none>        80/TCP                       23d   app=quote
kube-system   service/kube-dns     ClusterIP   10.96.0.10       <none>        53/UDP,53/TCP,9153/TCP       86d   k8s-app=kube-dns

NAMESPACE     NAME                         DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR            AGE   CONTAINERS    IMAGES                           SELECTOR
kube-system   daemonset.apps/calico-node   4         4         4       4            4           kubernetes.io/os=linux   86d   calico-node   docker.io/calico/node:v3.22.1    k8s-app=calico-node
kube-system   daemonset.apps/kube-proxy    4         4         4       4            4           kubernetes.io/os=linux   86d   kube-proxy    k8s.gcr.io/kube-proxy:v1.21.10   k8s-app=kube-proxy

NAMESPACE     NAME                                      READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS                IMAGES                                      SELECTOR
kube-system   deployment.apps/calico-kube-controllers   1/1     1            1           86d   calico-kube-controllers   docker.io/calico/kube-controllers:v3.22.1   k8s-app=calico-kube-controllers
kube-system   deployment.apps/coredns                   2/2     2            2           86d   coredns                   k8s.gcr.io/coredns/coredns:v1.8.0           k8s-app=kube-dns

NAMESPACE     NAME                                                 DESIRED   CURRENT   READY   AGE   CONTAINERS                IMAGES                                      SELECTOR
kube-system   replicaset.apps/calico-kube-controllers-6fd7b9848d   1         1         1       86d   calico-kube-controllers   docker.io/calico/kube-controllers:v3.22.1   k8s-app=calico-kube-controllers,pod-template-hash=6fd7b9848d
kube-system   replicaset.apps/coredns-558bd4d5db                   2         2         2       86d   coredns                   k8s.gcr.io/coredns/coredns:v1.8.0           k8s-app=kube-dns,pod-template-hash=558bd4d5db