From owner-freebsd-net Thu Oct 17 17:56: 6 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EBD2137B401 for ; Thu, 17 Oct 2002 17:56:03 -0700 (PDT) Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7B5F143E88 for ; Thu, 17 Oct 2002 17:56:03 -0700 (PDT) (envelope-from larse@ISI.EDU) Received: from isi.edu (nik.isi.edu [128.9.168.58]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id g9I0u2C21626; Thu, 17 Oct 2002 17:56:02 -0700 (PDT) Message-ID: <3DAF5C21.6000108@isi.edu> Date: Thu, 17 Oct 2002 17:56:01 -0700 From: Lars Eggert User-Agent: Mozilla/5.0 (X11; U; Linux i386; en-US; rv:1.1) Gecko/20020826 X-Accept-Language: en-us, de-de MIME-Version: 1.0 To: Charles Henrich Cc: freebsd-net@freebsd.org Subject: Re: IPSEC/NAT issues References: <20021017162243.B89519@sigbus.com> <3DAF509C.6030002@isi.edu> <20021017172905.A91625@sigbus.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms090601060501040507040902" Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org This is a cryptographically signed message in MIME format. --------------ms090601060501040507040902 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Charles Henrich wrote: > The nat daemon does not log any rejections of the packet, however in my kernel > log, I see a > > Oct 17 17:23:51 dmz /kernel: Connection attempt to TCP B:3283 from C:22 Your packets don't seem to reach natd after IPsec inbound processing. Looks like ipfw processing happens before IPsec (so natd sees the IPsec'ed packets, but doesn't know anything about them), and gets thems them after IPsec inbound processing. What you want is a way to do IPsec first, and then ipfw processing, but I don't know if that can be done. Try configuring an IPIP tunnel between B and C, and transport-mode IPsec that. That way, your NAT packets get tunneled, and the tunneled packets secured. On inbound, security processing comes first, then decapsulation, then ipfw. 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