Re: [DNSOP] Call for Adoption: draft-song-atr-large-resp

Mukund Sivaraman <muks@mukund.org> Thu, 07 February 2019 19:09 UTC

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Date: Fri, 8 Feb 2019 00:39:27 +0530
From: Mukund Sivaraman <muks@mukund.org>
To: Peter van Dijk <peter.van.dijk@powerdns.com>
Cc: dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] Call for Adoption: draft-song-atr-large-resp
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Hi Peter

On Mon, Jan 21, 2019 at 11:22:00AM +0100, Peter van Dijk wrote:
> The draft doubles the number of packets involved in a legitimate
> exchange; it more than doubles the number of packets involved in a
> spoofed exchange. About half of these packets are ICMP
> packets. Without the draft, ICMP packets are useful debugging aids,
> and in big numbers, indications of attacks or operational
> problems. With the draft, ICMP becomes another useless source of
> background noise.

I had implemented the draft about a year ago as a server-side patch for
BIND so that it could be tried/tested. But I was not aware of the ICMP
issue that you mentioned. Today I looked at a packet capture with ATR
response and sure enough, the 2nd truncated response generates an ICMP
message from the recipient. I agree that this would be noisy.

		Mukund