以太网帧格式

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Ethernet II

EthernetII::=SEQUENCE{
DestinationAddress    OCTET STRING(SIZE(6)),
SourceAddress         OCTET STRING(SIZE(6)),
Type                  OCTET STRING(SIZE(2)),
Date                  OCTET STRING(SIZE(46..1500)),
FCS                   OCTET STRING(SIZE(4))
}

Ethernet802.3RAW::=SEQUENCE{
DestinationAddress    OCTET STRING(SIZE(6)),
SourceAddress         OCTET STRING(SIZE(6)),
Tolength                  OCTET STRING(SIZE(2)),
Int                    INTEGER(0xFFFF),
Date                    OCTET STRING(SIZE(44..1496)),
FCS                   OCTET STRING(SIZE(4))
}

Ethernet802.3SAP::=SEQUENCE{
DestinationAddress    OCTET STRING(SIZE(6)),
SourceAddress         OCTET STRING(SIZE(6)),
Tolength                  OCTET STRING(SIZE(2)),
DSAP                      OCTET STRING(SZIE(1)),
SSAP                       OCTET STRING(SIZE(1)),
Contur                     OCTET STRING(SIZE(1)),
Date                     OCTET STRING(43..1497),
FCS                      OCTET STRING(SIZE(4))
}

Ethernet802.3SNAP::=SEQUENCE{
DestinationAddress    OCTET STRING(SIZE(6)),
SourceAddress         OCTET STRING(SIZE(6)),
Tolength                  OCTET STRING(SIZE(2)),
DSAP                    INTEGER(0xAA),
SSAP                     INTEGER(0xAA),
OUIID                    OCTET STRING(SZIE(3)),
Date                    OCTET STRING(SIZE(38..1492)),
FCS                     OCTET STRING(SIZE(4))
}