The RFC Sourcebook is a comprehensive guide to the Request for Comments (RFCs) series of documents published by the IETF.
http://www.networksorcery.com/enp/default.htm
互联网协议族的全面详尽指南，各种网络协议格式详解
如ICMPv6:
这里查看各字段值的含义： https://www.iana.org/protocols
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