On 6/9/2014 6:34 AM, David Singer wrote:

On Jun 8, 2014, at 20:26 , Joe Touch <to...@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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