I can't see istio's traffic in Envoy outbound port 15001 or Envoy inbound port 15006

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After deploy the sample application,I want to see the life of a Packet in ISTIO According to this article.

After I execute the below command, I get nothing.

tcpdump -i calib5d7dbd52bc port 15006 -A

The calib5d7dbd52bc is a veth pair of the pod productpage-v1

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on calib5d7dbd52bc, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
0 packets received by filter
>
> 0 packets dropped by kernel
0

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