[dns-operations] TTL analysis: "How Long Does a Second Actually Last?"
jared at puck.nether.net
Fri Mar 10 17:15:26 UTC 2017
On Fri, Mar 10, 2017 at 10:52:28AM -0500, David C Lawrence wrote:
> Interesting but five year old page I'd only just now come across for
> the first time. Thought some of you would find it interesting as
> well. Apologies if it has actually been discussed before and I just
> missed it.
Few other interesting behaviours out there:
1) unbound has serve-expired, which other dns implemenations
have, this minimizes impact when authorities are down or unreachable.
2) should look at the "zombie" research as well, this relates
to TTL in a related work. Many qnames seem to live on for extended
periods of time:
3) When using an unnamed vendors load balancer for DNS queries
back in the early 90s, it had serious issues with TTL expiry handling
when the replies were sub-10 second TTLs.
Jared Mauch | pgp key available via finger from jared at puck.nether.net
clue++; | http://puck.nether.net/~jared/ My statements are only mine.
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