From owner-freebsd-net Tue Jun 18 8:16: 9 2002 Delivered-To: freebsd-net@freebsd.org Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by hub.freebsd.org (Postfix) with ESMTP id 8BDB437B406 for ; Tue, 18 Jun 2002 08:16:00 -0700 (PDT) Received: from isi.edu (c1-vpn3.isi.edu [128.9.176.29]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id g5IFFwr27744; Tue, 18 Jun 2002 08:15:58 -0700 (PDT) Message-ID: <3D0F4EAE.5090207@isi.edu> Date: Tue, 18 Jun 2002 08:15:58 -0700 From: Lars Eggert Organization: USC Information Sciences Institute User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1a) Gecko/20020611 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Christophe Prevotaux Cc: net@freebsd.org Subject: Re: IPIP (kind of) with Payload Encryption only References: <20020618153956.2a9352fa.c.prevotaux@hexanet.fr> <200206181352.g5IDqqnq047326@whizzo.transsys.com> <3D0F4AFA.3000908@isi.edu> <20020618170639.3754910d.c.prevotaux@hexanet.fr> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms010601060805090305030807" 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. --------------ms010601060805090305030807 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Christophe Prevotaux wrote: > I can use AH/ESP however since I am using a satellite link > thru a modem/hub(NOC) that fiddles around with packets in order > to optimize them , I can't encrypt the headers otherwise the > optimizer can't see inside the packets and therefore can't see the > headers , so no optimization is done ,and I end up with a 33,6Kbps > like speed for the VPN , which is useless (at best 56Kbps). You could try (transport mode) IPsec over a UDP tunnel, if your middlebox mucks with the L4 headers. Then again, your middlebox probably only "optimizes" TCP - have you benmarked TCP vs. UDP performance over the link? (If so, you'll need to use a TCP tunnel.) 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