and \fBDF\fP is reported if F is set. If neither are set, \fB.\fP is
reported.
\fIproto\fP is the protocol ID field.
-\fIlength\fP is the total length field.
+\fIlength\fP is the total length field; if the packet is a presumed TSO
+(TCP Segmentation Offload) send, [was 0, presumed TSO] is reported.
\fIoptions\fP are the IP options, if any.
.LP
Next, for TCP and UDP packets, the source and destination IP addresses