From: Henrik Nordstrom <hno@marasystems.com>
To: don-nf@isis.cs3-inc.com (Don Cohen), netfilter-devel@lists.samba.org
Subject: Re: Syncookie firewall
Date: Wed, 5 Jun 2002 21:38:14 +0200 [thread overview]
Message-ID: <200206052138.14928.hno@marasystems.com> (raw)
In-Reply-To: <15614.26348.278645.301276@isis.cs3-inc.com>
Don Cohen wrote:
> There are some tcp options that have to be sent in the syn packet,
> e.g., window scale. These become unusable if this packet is supplied
> by the firewall, unless the firewall somehow knows how the original
> destination host "would have" answered. This seems unfortunate, and
> I don't see a good solution.
Not to mention that there is TCP options a firewall cannot know, such as the
timestamp option.
In my opinion, If you do "syncookie" in a firewall then the TCP should be
terminated there, with another TCP in to the real server. I.e. a proxy
solution.
Regards
Henrik Nordström
next prev parent reply other threads:[~2002-06-05 19:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20020603132204.7934546FF@lists.samba.org>
2002-06-05 19:30 ` Syncookie firewall Don Cohen
2002-06-05 19:38 ` Henrik Nordstrom [this message]
[not found] <20020606192927.6B7684DCE@lists.samba.org>
2002-06-06 21:18 ` Don Cohen
2002-06-06 21:34 ` Henrik Nordstrom
2002-06-06 22:03 ` Mark Atwood
2002-06-06 22:36 ` Don Cohen
[not found] <20020606020322.05BF64258@lists.samba.org>
2002-06-06 16:28 ` Don Cohen
2002-06-06 17:32 ` Henrik Nordstrom
2002-06-07 9:21 ` Michel Banguerski
2002-06-07 9:47 ` Michel Banguerski
2002-06-07 9:56 ` Henrik Nordstrom
2002-06-02 18:47 Michel Banguerski
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