When Listen modeListen mode is enabled, the transmitter will await an external TCP
connection before the actual traffic frames are sent. This makes it possible to
pass a firewall/nat router from the other side (Remark: you must have
something establishing the TCP connection from the inner side e.g. Network
Master). In this mode the peers MAC, IP, and Port are taken from the incoming
TCP connection.
Src PortSrc Port
Src PortSrc Port identifies the sending port.
Dst PortDst Port
Dst PortDst Port identifies the receiving port.
Seq numberSeq number
If the SYNSYN check box is selected, this value is set to the sequence number of
SYN packet. The sequence number of the first TCP packet which follows SYN
packet is this value plus 1.
If the SYNSYN check box is not selected, then this value is set to the sequence
number of the first TCP packet to be sent.
When the interface bit rate is 100 Gbps or less, the Auto incrementAuto increment check box
may be selected in order for the Sequence number to follow the number of
data bytes sent (Remark: the first data byte will be number zero in this mode,
and not the number entered into the Seq numberSeq number field).
Ack numberAck number
If the ACKACK check box is selected, then the value of this field is the sequence
number that the Network Master expects to receive in next TCP packet.
Data offsetData offset
Data offsetData offset specifies the size of the TCP header in 32-bit words. This is set
automatically.
ReservedReserved
Reserved for future use and should be set to zero.
FlagsFlags
Contains 8 bit flags (control bits). The flags may be programmed individually,
however when Auto connectAuto connect check box is selected, most of the flags are
controlled by the TCP state engine.
WindowWindow
Specifies the size of the sliding window (i.e. the maximum receiver buffer). The
WindowWindow defines the number of bytes that may be sent before waiting for an
acknowledgement from the receiver.
ChecksumChecksum
The 16-bit checksum field is used for error-checking of the header and data.
Urgent pointerUrgent pointer
If the URGURG flag is set then this 16-bit field is an offset from the sequence
number indicating the last urgent data byte.
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