5G E2E組網，通常有專業的UE抓包工具，能夠清新的顯示，各種信令和其他的各種信息。
但是這種專業的抓包工具，都不免費。
這里總結一下， TCPDUMP/Wirshark抓包的過程。
1. UPF抓包
這里有一個GTP-U抓包實例（ping 包）： https://www.cloudshark.org/captures/374cf36574b6
Ping request
Ping reply
2. eCPRI
Enabling Interoperability & Adherence to O-RAN Fronthaul Interface （介紹的比較詳細）
L1
Improving the process of debugging communication patterns in 5G Layer 1
5G_AKA協議
基於free5gc+UERANSIM 5G模擬環境的5G_AKA協議解析
REF：
guide for Wireshark ：
Wireshark 101: Getting around (step-by-step)
Using Wireshark™ to View Protocol Data Units
Chapter 7. Advanced Topics -Prev 7.8. Packet Reassembly
wireshark Display Filter Reference
NR Radio Resource Control (RRC) protocol
evolved Common Public Radio Interface (eCPRI)
wireshark SampleCaptures
https://wiki.wireshark.org/SampleCaptures
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