1 This module matches packets related to a specific conntrack-helper.
3 .BI "--helper " "string"
4 Matches packets related to the specified conntrack-helper.
7 string can be "ftp" for packets related to a ftp-session on default port.
8 For other ports append -portnr to the value, ie. "ftp-2121".
10 Same rules apply for other conntrack-helpers.