AFS and RX.
.LP
If the -v (verbose) flag is given twice, acknowledgement packets and
-additional header information is printed, such as the the RX call ID,
+additional header information is printed, such as the RX call ID,
call number, sequence number, serial number, and the RX packet flags.
.LP
If the -v flag is given twice, additional information is printed,
-such as the the RX call ID, serial number, and the RX packet flags.
+such as the RX call ID, serial number, and the RX packet flags.
The MTU negotiation information is also printed from RX ack packets.
.LP
If the -v flag is given three times, the security index and service id