Mitsubishi Electric FX3U-ENET-ADP, User Manual

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Appendix E: Document, others
Appendix E-4 References
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-ENET-ADP User's Manual
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Program Examples
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Appendix E-4 References
For details on TCP/IP, refer to the DDN Protocol Handbook (3 volumes).
Publisher
DDN Network Information Center
SRI International
333 Ravenswood Avenue, EJ291
Menlo Park, California 94025
RFC Number
TCP RFC793
UDP RFC768
IP RFC791
ICMP RFC792
ARP RFC826
Appendix E-5 Differences between Ethernet and IEEE802.3
The following shows the Ethernet header in the data link layer supported by the Ethernet adapter.
1) Ethernet
2) IEEE802.3
Appendix E-6 ICMP Protocol Supported by Ethernet adapter
The following table outlines the types of ICMP supported by the Ethernet adapter and the processing
performed by the Ethernet adapter.
*1. The Ethernet adapter can simultaneously receive two ICMP ECHO requests (type 8, Ping message),
which are used for existence confirmation, etc., and handles them accordingly.
When three or more ICMP ECHO requests are received at the same time, the third and succeeding
requests will be ignored.
If a response is not returned to the external device when an ICMP ECHO request is sent to the
Ethernet adapter, send an ICMP ECHO request to the Ethernet adapter again.
The Ethernet adapter is able to receive a maximum of 1460 bytes ICMP message at one time.
Do not send an ICMP message request exceeding 1460 bytes to the Ethernet adapter.
Ethernet data link layer header Ethernet adapter
Ethernet frame (V 2.0) specification
IEEE802.3 (ISO/IEC8802.3) frame specification
ICMP Type ICMP name/description Processing by the Ethernet adapter
0
Echo Reply
Result of IP packet loopback
Upon receiving an Echo Request, the Ethernet adapter sends this message.
8
Echo Request
Requests loopback of IP packet
If destination existence confirmation is set in the buffer memory, the Ethernet
adapter sends this message when attempting to confirm the existence of the
target.
*1
Others - Ignored by the Ethernet adapter. (Not supported)
Destination address Source address Type Data (46 to 1500 bytes) FCS
Destination address Source address Length Data (46 to 1500 bytes) FCS