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if_ether.h, dated back to 1991, Integrated Solution, Inc. used the following definitions. #define ETHERTYPE_WIPC 0x80DE /* ISI: WIPC protocol */ #define ETHERTYPE_ISIBOOT 0x80DF /* ISI: bootd enet protocol */ #define ETHERTYPE_ISIBOOT_OLD 0x0807 /* ISI: old bootd (NOT OFFICIAL!) */ #define ETHERTYPE_RFS 0x0813 /* ISI: RFS protocol (NOT OFFICIAL!) */ No functionality change is expected.