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Re: Last Call: draft-irtf-asrg-dnsbl (DNS Blacklists and Whitelists)

Keith Moore <moore@network-heretics.com> Mon, 10 November 2008 18:39 UTC

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Date: Mon, 10 Nov 2008 13:38:59 -0500
From: Keith Moore <moore@network-heretics.com>
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To: Tony Finch <dot@dotat.at>
Subject: Re: Last Call: draft-irtf-asrg-dnsbl (DNS Blacklists and Whitelists)
References: <20081110130255.49372.qmail@simone.iecc.com> <491850D0.2070300@network-heretics.com> <alpine.LSU.2.00.0811101820090.30582@hermes-1.csi.cam.ac.uk>
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Tony Finch wrote:
> On Mon, 10 Nov 2008, Keith Moore wrote:
>> I suspect it will be very difficult to make IPv6 DNSxLs work anywhere
>> nearly as well as IPv4 DNSxLs, because in IPv6 it is fairly easy to use
>> a different address for every SMTP conversation.
> 
> I expect that attack will make /48 or /64 listings common. This has the
> obvious downside of an increased risk of one infected host spoiling email
> connectivity for its immediate neighbours, even more than is already the
> case for IPv4 DNSBLs. Perhaps ISPs and hosting providers can mitigate that
> by enforcing address allocation policies.

Or perhaps enterprise networks will be forced to outsource their mail
submission to third parties with supposedly "trustworthy" addresses.
Which IMHO would not be a desirable result.

> In any case, DNSBLs should scale roughly according to the size of the
> routing table, not the size of the address space.

What does it mean for a DNSBL to "scale"?

Keith
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