在IP报头的协议字段中可能发现的协议

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在IP
报头的协议字段中可能发现的协议

协议	协议号
ICMP	1
IGRP	9
EIGRSP	88
OSPF	89
IPv6	41
GRE	47
IPX in IP	111
Layer-2 tunnel(L2TP)	115