linux-kernel - RE: linux tcp stack behavior change

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Message-Id: <200612262134.11609.askadar@hvk-gymnasium.de>
Date:	Tue, 26 Dec 2006 21:34:11 -0500
From:	Askadar <askadar@...-gymnasium.de>
To:	linux-kernel@...r.kernel.org
Subject: RE: linux tcp stack behavior change

> However, I know that plain -sF worked with previous kernels. Using
> nmap-4.00 on 2.6.18.5 yields the same result, so I do not think it is
> caused by a change in nmap code. Could someone with 2.6.13-2.6.17 verify
> that the TCP stack returned a RST?

Works for me on 2.6.18.3:

[root@...12 bb]# tcpdump -ni lo &
[root@...12 bb]# nmap localhost -n -sX -p 22

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2006-12-26 21:26 EST
21:26:09.217187 IP 127.0.0.1.46872 > 127.0.0.1.22: FP 4139391634:4139391634(0) 
win 1024 urg 0
21:26:09.217355 IP 127.0.0.1.22 > 127.0.0.1.46872: R 0:0(0) ack 4139391635 win 
0
Interesting ports on 127.0.0.1:
PORT   STATE  SERVICE
22/tcp closed ssh

[root@...12 bb]# uname -a
Linux DS-12 2.6.18-ARCH #1 SMP PREEMPT Sun Nov 19 09:14:35 CET 2006 i686 
Intel(R) Pentium(R) 4 Mobile CPU 1.80GHz GenuineIntel GNU/Linux

[root@...12 bb]# pacman -Q kernel26
kernel26 2.6.18.3-1

- Björn
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