5G 抓包
5G E2E组网，通常有专业的UE抓包工具，能够清新的显示，各种信令和其他的各种信息。
但是这种专业的抓包工具，都不免费。
这里总结一下， TCPDUMP/Wirshark抓包的过程。
1. UPF抓包
这里有一个GTP-U抓包实例（ping 包）： https://www.cloudshark.org/captures/374cf36574b6
Ping request
Ping reply
2. eCPRI
Enabling Interoperability & Adherence to O-RAN Fronthaul Interface （介绍的比较详细）
L1
Improving the process of debugging communication patterns in 5G Layer 1
5G_AKA协议
基于free5gc+UERANSIM 5G模拟环境的5G_AKA协议解析
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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