Date: Tue, 18 Jun 2002 08:15:58 -0700 From: Lars Eggert <larse@ISI.EDU> To: Christophe Prevotaux <c.prevotaux@hexanet.fr> Cc: net@freebsd.org Subject: Re: IPIP (kind of) with Payload Encryption only Message-ID: <3D0F4EAE.5090207@isi.edu> References: <20020618153956.2a9352fa.c.prevotaux@hexanet.fr> <200206181352.g5IDqqnq047326@whizzo.transsys.com> <3D0F4AFA.3000908@isi.edu> <20020618170639.3754910d.c.prevotaux@hexanet.fr>
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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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