The LOGMARK target will log packet and connection marks to syslog.
.TP
\fB--log-level\fR \fIlevel\fR
A logging level between 0 and 8 (inclusive).
.TP
\fB--log-prefix\fR \fIstring\fR
Prefix log messages with the specified prefix; up to 29 bytes long, and useful
for distinguishing messages in the logs.
.TP
\fB--log-nfmark\fR
Include the packet mark in the log.
.TP
\fB--log-ctmark\fR
Include the connection mark in the log.
.TP
\fB--log-secmark\fR
Include the packet secmark in the log.