Date: Mon, 16 Apr 2001 13:08:14 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Darren Reed <avalon@coombs.anu.edu.au> Cc: Kris Kennaway <kris@obsecurity.org>, Mike Silbersack <silby@silby.com>, Mark T Roberts <newsletter@marktroberts.com>, freebsd-security@FreeBSD.ORG, net@FreeBSD.ORG Subject: Re: non-random IP IDs Message-ID: <20010416130814.A12057@xor.obsecurity.org> In-Reply-To: <200104162002.GAA09062@caligula.anu.edu.au>; from avalon@coombs.anu.edu.au on Tue, Apr 17, 2001 at 06:02:42AM %2B1000 References: <20010416120630.C10023@xor.obsecurity.org> <200104162002.GAA09062@caligula.anu.edu.au>
next in thread | previous in thread | raw e-mail | index | archive | help
--M9NhX3UHpAaciwkO Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 17, 2001 at 06:02:42AM +1000, Darren Reed wrote: > > > You should optimize it for mod being 2^n-1 (or make that a requiremen= t). > >=20 > > I'm afraid I don't have time to look at this right now. Perhaps it > > can be revisited (the sysctl defaults to off for now), or Niels Provos > > may be interested in the idea. >=20 > Basically it means '% mod' -> '& mod' and call it with a 2^n-1 number. Oh, okay. > > Well, it still has wrapping properties like a network-order counter, > > i.e. the algorithm attempts to order the output so that it doesn't > > wrap within the segment lifetime. That would be lost without using > > HTONS. >=20 > You're confusing properties of the local number and some opaque bits in > a packet being sent over the 'net. Quite likely. Kris --M9NhX3UHpAaciwkO Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE621EuWry0BWjoQKURApyyAKCBB7Zt5a4iTdLd/p5UfsjwffMpBwCfScng oR2Ef5UAJZl7DV94q312HM0= =hVp+ -----END PGP SIGNATURE----- --M9NhX3UHpAaciwkO-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010416130814.A12057>