libxt_helper.man revision 946397340806ca9f0bab7e0371668058e7a98de4 
1This module matches packets related to a specific conntrack-helper.
2.TP
3.BI "--helper " "string"
4Matches packets related to the specified conntrack-helper.
5.RS
6.PP
7string can be "ftp" for packets related to a 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