path: root/iptables.8
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Diffstat (limited to 'iptables.8')
1 files changed, 11 insertions, 0 deletions
diff --git a/iptables.8 b/iptables.8
index db9a691b..c1039fb0 100644
--- a/iptables.8
+++ b/iptables.8
@@ -445,6 +445,17 @@ into it's according numeric value.
This module matches the SPIs in ESP header of IPSec packets.
.BR "--espspi " "[!] \fIspi\fP[:\fIspi\fP]"
+.SS helper
+This module matches packets related to a specific conntrack-helper.
+.BI "--helper " "string"
+Matches packets related to the specified conntrack-helper.
+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".
+Same rules apply for other conntrack-helpers.
.SS icmp
This extension is loaded if `--protocol icmp' is specified. It
provides the following option: