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ROPE Language Reference - "$tcp_seq"

"$tcp_seq" holds the TCP/IP sequence number contained in the packet being inspected.

RFC_793 describes this field thus

Sequence Number:  32 bits

 The sequence number of the first data octet in this segment (except
 when SYN is present). If SYN is present the sequence number is the
 initial sequence number (ISN) and the first data octet is ISN+1.

This is a read-only register.

This field is only relevant for TCP/IP packets, and will contain the value 0 for others types.

ROPE Language Reference - "$tcp_seq"

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