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This module matches packets related to a specific conntrack-helper.
.TP
.BI "--helper " "string"
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