lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 12 Aug 2014 10:08:42 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, fw@...len.de
Subject: Re: [PATCH net] tcp: don't allow syn packets without timestamps to pass
 tcp_tw_recycle logic



On Tue, Aug 12, 2014, at 05:08, David Miller wrote:
> From: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Date: Tue, 12 Aug 2014 02:21:36 +0200
> 
> > Thus this broken situation could easily arise by a Linux and Windows
> > box sharing one IP address and talking to a tcp_tw_recycle enabled
> > server.
> 
> As Eric Dumazet mentioned, timewait recycling does not work if any
> traffic goes through a NAT box.
> 
> So this situation of two boxes "sharing one IP address" fundamentally
> makes timewait recycling unusable.

Exactly, I'll just throw away the SYN packet instead of opening a
connection where we couldn't very if the preconditions for timewait
recycling did not hold.

Bye,
Hannes
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists