Customer Service Center

Environment/Versions Spirent TestCenter IP Fragmentation using Raw streamblocks Answer  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. Click here for sample video you can use any ftp app to retrieve this file (below example at a windows command prompt) C:\Users\example001\Downloads>ftp kbfiles.spirent.com Connected to dmzcalcsftp01.spirentcom.com. 220 (vsFTPd 3.0.3) 200 Always in UTF8 mode. User (dmzcalcsftp01.spirentcom.com:(none)): anonymous 230 Login successful. ftp> get /SpirentTestCenter/kb_articles/FAQ11157/Training_IPv4-n-IPv6_fragments.zip 200 PORT command successful. Consider using PASV. 150 Opening BINARY mode data connection for /SpirentTestCenter/kb_articles/FAQ11157/Training_IPv4-n-IPv6_fragments.zip (439863029 bytes). 226 Transfer complete. ftp: 439863029 bytes received in 10.65Seconds 41282.31Kbytes/sec. ftp>