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