netdev - Re: [RFC PATCH 00/18] netfilter: IPv6 NAT

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Date:	Tue, 29 Nov 2011 23:21:11 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Krzysztof Olędzki <ole@....pl>
cc:	Ulrich Weber <ulrich.weber@...hos.com>,
	Amos Jeffries <squid3@...enet.co.nz>,
	"sclark46@...thlink.net" <sclark46@...thlink.net>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH 00/18] netfilter: IPv6 NAT


On Tuesday 2011-11-29 22:38, Krzysztof Olędzki wrote:
>>
>> Same network prefix, some cookies, or a login form. Blam, identified,
>> or at least (Almost-)Uniquely Identified Visitor tagging.
>
> But without NAT you have pretty big chance to have the same IPv6 *suffix*
> everywhere, based on you MAC address.

Everywhere? No, one small village of indomitable Gauls.^^^^^^^^W

$ ip a
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0d:93:9e:08:78 brd ff:ff:ff:ff:ff:ff
    inet6 2001:638:600:8810:d070:3a36:464e:b3db/64 scope global temporary dynamic 
       valid_lft 583732sec preferred_lft 64732sec
    inet6 2001:638:600:8810:d9f5:18f5:4fc1:9a20/64 scope global temporary deprecated dynamic 
       valid_lft 497938sec preferred_lft 0sec
    [...]

Same suffix? Certainly not with contemporary configurations (and
Linux did this quite on its own there). In fact, now that there is
almost v6-NAT in the kernel, I fear that users who are blinded by NAT
now make the problem worse by actually feeding perfectly good Privacy
Extension Addresses into a n:1-configured SNAT/MASQUERADE target
instead of a NETMAP.

> In your Home, your Work, in a Cafe or in
> a hotel during your vacations in Portugal.
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