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Spirent KB Article
Doc ID: FAQ11157
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Spirent TestCenter: How to send IPv4 fragments with raw streamblock?
IP Fragmentation using Raw streamblocks
When trying to send fragment packets, the "fragment offset" value should be right, or else DUT or wireshark can't reassemble the packets.
The unit of "Fragment offset" is 8 bytes.
So if the frame length of each fragment is 1514(without FCS), the data length in the IP packet is 1514 - 14(Ethernet Header) - 20(IP Header) =1480
"Fragment offset" of the second fragment should be 1480/8 = 185
So the value of "Fragment offset" be set in the STC should be 185 (For second fragment), 370(For the third fragment) and so on
Note : All fragments must have the same Identification field value in the IP Header.
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Spirent TestCenter: Does TestCenter utilize Port MTU size or other method to send and receive (disassemble and reassemble) fragment packets (fragmentation)?