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Reference : Expert view columns : Flow Visualizer TCP Trace graph flags
Flow Visualizer TCP Trace graph flags
The following table describes each of the flags in the TCP Trace graph of the Flow Visualizer.
Client
Server
Flag
Description
 
yes
 
TCP PUSH flag set (appear as a diamond, rather than an arrowhead, and do not have a text label)
yes
yes
FIN
TCP FIN flag set (shows a square, rather than an arrowhead)
yes
yes
SYN
TCP SYN flag set (shows a diamond, rather than an arrowhead)
yes
yes
U
TCP Urgent flag set
yes
 
RST_IN
TCP RST flag set in ACK packet from client
 
yes
RST_OUT
TCP RST flag set in packet from server
 
yes
R
Retransmitted data (at least one byte of SEQ overlaps)
 
yes
O
Out of sequence data
yes
 
Z
ACK packet with a zero window
 
yes
P
Zero window probe
yes
yes
!
The Expert identified an event for this packet
yes
yes
HD
Hardware Duplicate (also called IP Local Routing)
yes
 
S
Selective ACK (also shows a purple line, spanning the acknowledged sequence numbers)