1This module matches packets related to a specific conntrack helper. 2.TP 3[\fB!\fP] \fB\-\-helper\fP \fIstring\fP 4Matches packets related to the specified conntrack helper. 5.RS 6.PP 7string can be "ftp" for packets related to an FTP session on default port. 8For other ports, append \-\-portnr to the value, ie. "ftp\-2121". 9.PP 10Same rules apply for other conntrack helpers. 11.RE 12