From: georg@syscid.com
To: netfilter-devel@vger.kernel.org
Cc: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
Subject: [nftables PATCH] doc: fix tcpdump example
Date: Mon, 13 Oct 2025 19:17:31 +0200 [thread overview]
Message-ID: <20251013171730.1447005-2-georg@syscid.com> (raw)
From: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
The expression needs to be enclosed in a single string and combined with
a logical AND to have the desired effect.
Fixes: 1188a69604c3 ("src: introduce SYNPROXY matching")
Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
---
doc/statements.txt | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/doc/statements.txt b/doc/statements.txt
index 6226713ba389..834f95fbb2a8 100644
--- a/doc/statements.txt
+++ b/doc/statements.txt
@@ -691,8 +691,7 @@ needed for selective acknowledgement and window scaling).
---------------------------------------
Determine tcp options used by backend, from an external system
- tcpdump -pni eth0 -c 1 'tcp[tcpflags] == (tcp-syn|tcp-ack)'
- port 80 &
+ tcpdump -pni eth0 -c 1 'tcp[tcpflags] == (tcp-syn|tcp-ack) && port 80' &
telnet 192.0.2.42 80
18:57:24.693307 IP 192.0.2.42.80 > 192.0.2.43.48757:
Flags [S.], seq 360414582, ack 788841994, win 14480,
--
2.50.1
next reply other threads:[~2025-10-13 17:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-13 17:17 georg [this message]
2025-10-13 19:19 ` [nftables PATCH] doc: fix tcpdump example Fernando Fernandez Mancera
2025-10-13 19:43 ` Florian Westphal
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