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Sam On Thu, , Henry Linneweh wrote: duane wessels' presentation at the last eugene nanog meeting distinguished between two kinds of traffic received at f-root during his sampling work: crap: 97.9%; non-crap: 2.1%. the primary beneficiaries of this new functionality are spammers and other malfeasants, and the impact of having it in many TLD's will be to put downward pressure on TTL's. -- Paul Vixie I got forwarded this URL from Patrick Mc Manus.

the "crap" category includes requestors who do not seem to cache the responses they hear, thus rendering the actual TTL moot. I haven't had a chance to read the paper myself yet so I won't comment on it. A choice quote is "these results suggest that the performance of DNS is not as dependent on aggressive caching as is commonly believed, and that the widespread use of dynamic, low-TTL A-record bindings should not degrade DNS performance." This paper presents a detailed analysis of traces of DNS and associated TCP traffic collected on the Internet links of the MIT Laboratory for Computer Science and the Korea Advanced Institute of Science and Technology (KAIST).

When this becomes clear the pressure will be to deliver what the salespeople promised.

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The root server system is engineered to cope with hugely excessive loads already.

I am worried about all the other root servers that have to deal with much lesser query loads and might feel the impact of lowered TTLs much more.

These results suggest that the performance of DNS is not as dependent on aggressive caching as is commonly believed, and that the widespread use of dynamic, low-TTL A-record bindings should not degrade DNS performance.

Sam On Thu, , Sam Stickland wrote: I am not worried so much about the root servers here because of the reasons you cite.

I am not sure the DNS will remain stable if TTLs are lowered to a couple of seconds throughout.

I am suggesting clearer marketing: "Quick additions: Yes.

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In the most recent MIT trace, 23% of lookups receive no answer; these lookups account for more than half of all traced DNS packets since they are retransmitted multiple times.

About 13% of all lookups result in an answer that indicates a failure.

Quick changes/deletions: No." Note that I am not concerned about *judicious* lowering of TTLs in preparation for changes or to provide services such as akamai.

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