This module matches packets related to a specific conntrack-helper.
.TP
[\fB!\fP] \fB--helper\fP \fIstring\fP
Matches packets related to the specified conntrack-helper.
.RS
.PP
string can be "ftp" for packets related to a ftp-session on default port.
For other ports append -portnr to the value, ie. "ftp-2121".
.PP
Same rules apply for other conntrack-helpers.
.RE