csu3_am335x/EVSE/GPL/iptables-1.4.18/extensions/libxt_CT.man

The CT target allows to set parameters for a packet or its associated
connection. The target attaches a "template" connection tracking entry to
the packet, which is then used by the conntrack core when initializing
a new ct entry. This target is thus only valid in the "raw" table.
.TP
\fB\-\-notrack\fP
Disables connection tracking for this packet.
.TP
\fB\-\-helper\fP \fIname\fP
Use the helper identified by \fIname\fP for the connection. This is more
flexible than loading the conntrack helper modules with preset ports.
.TP
\fB\-\-ctevents\fP \fIevent\fP[\fB,\fP...]
Only generate the specified conntrack events for this connection. Possible
event types are: \fBnew\fP, \fBrelated\fP, \fBdestroy\fP, \fBreply\fP,
\fBassured\fP, \fBprotoinfo\fP, \fBhelper\fP, \fBmark\fP (this refers to
the ctmark, not nfmark), \fBnatseqinfo\fP, \fBsecmark\fP (ctsecmark).
.TP
\fB\-\-expevents\fP \fIevent\fP[\fB,\fP...]
Only generate the specified expectation events for this connection.
Possible event types are: \fBnew\fP.
.TP
\fB\-\-zone\fP \fIid\fP
Assign this packet to zone \fIid\fP and only have lookups done in that zone.
By default, packets have zone 0.
.TP
\fB\-\-timeout\fP \fIname\fP
Use the timeout policy identified by \fIname\fP for the connection. This is
provides more flexible timeout policy definition than global timeout values
available at /proc/sys/net/netfilter/nf_conntrack_*_timeout_*.