path: root/extensions/
diff options
authorHarald Welte <>2005-05-04 07:34:37 +0000
committerHarald Welte <>2005-05-04 07:34:37 +0000
commit38ed421276ff0312965c96754b4bc01d0e4f0679 (patch)
tree39713d398104f934f89df935cd2c1cf0c684111b /extensions/
parente556800cf137e49a47cf1ac889c613f5d33cfe3b (diff)
include FIN bit in mask of "--syn" bits
Diffstat (limited to 'extensions/')
1 files changed, 2 insertions, 2 deletions
diff --git a/extensions/ b/extensions/
index 48a068fa..e1f44057 100644
--- a/extensions/
+++ b/extensions/
@@ -32,12 +32,12 @@ will only match packets with the SYN flag set, and the ACK, FIN and
RST flags unset.
.B "[!] --syn"
-Only match TCP packets with the SYN bit set and the ACK and RST bits
+Only match TCP packets with the SYN bit set and the ACK,RST and FIN bits
cleared. Such packets are used to request TCP connection initiation;
for example, blocking such packets coming in an interface will prevent
incoming TCP connections, but outgoing TCP connections will be
-It is equivalent to \fB--tcp-flags SYN,RST,ACK SYN\fP.
+It is equivalent to \fB--tcp-flags SYN,RST,ACK,FIN SYN\fP.
If the "!" flag precedes the "--syn", the sense of the
option is inverted.