NAT etc. (was: Spam Control Considered Harmful)

Tim Salo salo at
Sun Nov 2 01:44:55 UTC 1997

> Date: Sat, 1 Nov 1997 17:37:57 -0500
> From: "Jay R. Ashworth" <jra at>
> To: "You're welcome" <nanog at>
> Subject: Re: NAT etc. (was: Spam Control Considered Harmful)
> 	[...]
> Well, yes, Paul, but unless I misunderstood you, that's exactly the
> point.  If a client inside a NAT cloud does a DNS lookup to a
> supposedly authoritative server outside, and the NAT box is _required_
> to strip off the signature (which it would, because it has to change
> the data), then it's not possibile, by definition, for any client
> inside such a NAT box to make any use of SecDNS.
> The point is that you _can't_ regenerate the signature, usefully to the
> client, anyway, precisely because _it is a signature_.

Presumably, the NAT could,

o	Verify the signature of the DNS responses it receives, and
	dump any responses that don't meet its [authentication]
	criteria, or

o	Sign the the response it creates and let the client verify
	the NAT's signature.  Presumably, the client will trust
	the NAT.


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