(The OSPF protocol data packet method is: first encapsulate a layer of OSPF header outside the OSPF data, and then encapsulate an IP header outside the OSPF header, and indicate 89 in the protocol number field of the IP header. The AuType field in the OSPF header can have three choices: 0 will not check this authentication field; 1 is normal authentication, this field will contain a password with a maximum length of 64 bits; 2 is MD5 authentication, this authentication field Will contain KeyID, authentication number)
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