Date: Tue, 10 Jun 2008 17:01:40 +0100 From: Rui Paulo <rpaulo@FreeBSD.org> To: Doug Barton <dougb@FreeBSD.org> Cc: freebsd-net@freebsd.org, so@freebsd.org Subject: Re: Proposal: Enable IPv6 Privacy Extensions (RFCs 3041/4941) by default Message-ID: <20080610160140.GB33773@epsilon.local> In-Reply-To: <484E0C08.1060800@FreeBSD.org> References: <484E0C08.1060800@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Jun 09, 2008 at 10:07:20PM -0700, Doug Barton wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: RIPEMD160 > > By default, IPv6 stateless autoconfiguration creates a 64 bit hostid > for each interface based on the mac address (for ethernet, but for us > that's the common case). This is convenient since if you're using RA > neither the user nor the admin has to do anything to get the node on > line, it "just works." There is a privacy issue with this however, > because this identifier is created in such a way as to make it > globally unique, the machine (and therefore in almost all cases the > user) can be tracked by third parties such as web sites, even if they > move from one network prefix to another, such as with a laptop. > > To address those privacy concerns RFC 3041 was written, and eventually > obsoleted by RFC 4941. ftp://ftp.rfc-editor.org/in-notes/rfc4941.txt > Our IPv6 implementation comes with the code to enable this feature, > but by default it is turned off. My proposal is to enable it by > default, and give the user a knob in rc.conf to turn it off. I'm > interested in any arguments y'all might have for or against. To test > this is pretty simple, add the following to /etc/sysctl.conf: > net.inet6.ip6.use_tempaddr=1 > net.inet6.ip6.prefer_tempaddr=1 > > The "normal" EUI-64-based address will still be configured, but there > will also be a random identifier added to the interface as an alias, > and outgoing traffic will go out from that address. > > In way of comparison, windows starting with XP enables this feature by > default for clients, and has a knob to enable it for servers. I'd be > interested to hear what other systems do. > > > Thoughts? +1. I'm okay with it. Regards, -- Rui Paulo
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080610160140.GB33773>