tcp_error (ACK_OLD, "Old ACK")
tcp_error (ACK_FUTURE, "Future ACK")
tcp_error (PKTS_SENT, "Packets sent")
-tcp_error (FILTERED_DUPACKS, "Filtered duplicate ACKs")
tcp_error (RST_SENT, "Resets sent")
tcp_error (RST_RCVD, "Resets received")
tcp_error (INVALID_CONNECTION, "Invalid connection")