From owner-freebsd-questions@FreeBSD.ORG Thu Nov 4 13:44:56 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8C46716A4F4 for ; Thu, 4 Nov 2004 13:44:56 +0000 (GMT) Received: from smtp.infracaninophile.co.uk (happy-idiot-talk.infracaninophile.co.uk [81.2.69.218]) by mx1.FreeBSD.org (Postfix) with ESMTP id 269DF43D54 for ; Thu, 4 Nov 2004 13:44:55 +0000 (GMT) (envelope-from m.seaman@infracaninophile.co.uk) Received: from happy-idiot-talk.infracaninophile.co.uk (localhost.infracaninophile.co.uk [IPv6:::1])iA4DiiJa004620 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 4 Nov 2004 13:44:44 GMT (envelope-from matthew@happy-idiot-talk.infracaninophile.co.uk) Received: (from matthew@localhost)iA4DiiZe004619; Thu, 4 Nov 2004 13:44:44 GMT (envelope-from matthew) Date: Thu, 4 Nov 2004 13:44:44 +0000 From: Matthew Seaman To: Jan Knoppers Message-ID: <20041104134444.GA4296@happy-idiot-talk.infracaninophile.co.uk> Mail-Followup-To: Matthew Seaman , Jan Knoppers , freebsd-questions@freebsd.org References: <20041104095710.GA659@happy-idiot-talk.infracaninophile.co.uk> <001501c4c258$c7d74120$9600000a@Desktop> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="82I3+IH0IqGh5yIs" Content-Disposition: inline In-Reply-To: <001501c4c258$c7d74120$9600000a@Desktop> User-Agent: Mutt/1.4.2.1i X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-1.5.6 (smtp.infracaninophile.co.uk [IPv6:::1]); Thu, 04 Nov 2004 13:44:44 +0000 (GMT) X-Virus-Scanned: clamd / ClamAV version devel-20040904, clamav-milter version 0.75l on smtp.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-2.8 required=5.0 tests=ALL_TRUSTED,AWL autolearn=ham version=3.0.1 X-Spam-Checker-Version: SpamAssassin 3.0.1 (2004-10-22) on happy-idiot-talk.infracaninophile.co.uk cc: freebsd-questions@freebsd.org Subject: Re: Is UDP header compression (RFC 2508) supported in FreeBSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Nov 2004 13:44:56 -0000 --82I3+IH0IqGh5yIs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Nov 04, 2004 at 11:26:42AM +0100, Jan Knoppers wrote: >=20 > >> Look at the Authors of that RFC. > >>=20 > >> Compare it with this statement in ppp(8): > >>=20 > >> vjcomp > >> Default: Enabled and Accepted. This option determines if > >> Van > >> Jacobson header compression will be used. >=20 > My understanding is that this vjcomp statement relates to TCP/IP header > compression only as described in RFC 1144 (Jacobson, V., "TCP/IP Compress= ion > for Low-Speed Serial Links", February 1990). This RFC explicitly excludes > UDP/IP header compression. RFC 2508 is intended to fill this gap. >=20 > So, you may very well be right, and I hope you do, but I do not see it > documented. Good point. Looking at /usr/src/usr.sbin/ppp/vjcomp.c it does appear to only affect the headers. Probably your best bet would be to ask the last committer to work on that code directly -- see the README.changes file in that directory. That's the usermode PPP implementation, but the alternative kernel mode pppd(8) doesn't appear to have had much work done on it for some time. That's just VJ header compression too. Cheers, Matthew --=20 Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks Savill Way PGP: http://www.infracaninophile.co.uk/pgpkey Marlow Tel: +44 1628 476614 Bucks., SL7 1TH UK --82I3+IH0IqGh5yIs Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFBijJMiD657aJF7eIRAoxbAJ9fuuLikPGmQBWxGDuPRoCpDEN5lwCgjUyL Vg2vOEceNWW1/16ldjMWt0Q= =Ib4j -----END PGP SIGNATURE----- --82I3+IH0IqGh5yIs--