36.4.0.0.1 The TCP header

The TCP header is defined by the hdr_tcp structure in the file ~ns/tcp.h. The base agent only makes use of the following subset of the fields:

ts_     /* current time packet was sent from source /
ts_echo_ /* for ACKs: timestamp field from packet associated with this ACK /
seqno_ /* sequence number for this data segment or ACK (Note: overloading!) /
reason_ /* set by sender when (re)transmitting to trace reason for send /