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Answer     1.       Create a raw-streamBlock 2.       Add Ethernet header 3.       Add IPv4 Header 4.       Add TCP/UDP header as shown below in the example Following Example shows adding TCP header # Create a stream block.   set hStreamBlock [stc::create streamBlock -under $hPortA -insertSig TRUE \                                                 -frameConfig "" -frameLengthMode FIXED  \     -maxFrameLength 1200 -FixedFrameLength 128]   # Add an EthernetII Protocol Data Unit (PDU).                   stc::create ethernet:EthernetII -under $hStreamBlock -name sb1_eth  \ -srcMac 00:00:00:00:00:00  -dstMac 00:00:00:00:00:00 # Add IP PDU                 stc::create ipv4:IPv4 -under $hStreamBlock -name sb1_ip \  -sourceAddr 10.0.0.2 -destAddr 192.168.1.1   # Add TCP                 stc::create tcp:Tcp -under $hStreamBlock -name sb1_tcp -destPort 11