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Re: [Int-area] [ietf-privacy] NAT Reveal / Host Identifiers

Joe Touch <touch@isi.edu> Mon, 09 June 2014 15:31 UTC

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Date: Mon, 09 Jun 2014 08:30:32 -0700
From: Joe Touch <touch@isi.edu>
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To: David Singer <singer@apple.com>
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Cc: "ietf-privacy@ietf.org" <ietf-privacy@ietf.org>, Internet Area <int-area@ietf.org>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [Int-area] [ietf-privacy] NAT Reveal / Host Identifiers
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On 6/9/2014 6:34 AM, David Singer wrote:
>
> On Jun 8, 2014, at 20:26 , Joe Touch <touch@ISI.EDU> wrote:
>
>> 	a NAT hides the host *at the expense* of exposing a router
>
> If I have the energy to do a DoS attack, surely I have the energy to
> traceroute the hosts I know to find a common routing point?

1) ICMPs are often blocked - either at network boundaries or inside 
routers themselves

2) an ICMP tells you only how your packets get to the destination; it 
says nothing about how other traffic gets there or the return path

A NAT address tells you both directions and *cannot* be hidden except by 
another NAT along the same path.

Joe

>
> David Singer
> Manager, Software Standards, Apple Inc.
>

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