📅 Original date posted:2011-08-03
🗒️ Summary of this message: Some ISPs may cache DNS for up to a week, ignoring TTL, but it's unlikely for professional ISPs as it causes issues with popular sites. Randomizing DNS requests is a good idea.
📝 Original message:>
> Someone I know who runs a moderately large website told me that some ISPs
> cache DNS for as long as a week without regard to TTL.
>
We track DNS disobeyers at Google, as we use it for load balancing (along
with many other large sites).
I'd be kind of surprised if any large/professional ISP disobeyed the TTL
that badly, because it would cause frequent problems reaching popular sites
like anything hosted on Google or Akamai. But randomizing the DNS request
isn't a bad idea.
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Mike Hearn [ARCHIVE] /
npub17t…4qgyd
2023-06-07 02:10:47
in reply to nevent1q…45pt
Author Public Key
npub17ty4mumkv43w8wtt0xsz2jypck0gvw0j8xrcg6tpea25z2nh7meqf4qgydPublished at
2023-06-07 02:10:47Event JSON
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"content": "📅 Original date posted:2011-08-03\n🗒️ Summary of this message: Some ISPs may cache DNS for up to a week, ignoring TTL, but it's unlikely for professional ISPs as it causes issues with popular sites. Randomizing DNS requests is a good idea.\n📝 Original message:\u003e\n\u003e Someone I know who runs a moderately large website told me that some ISPs\n\u003e cache DNS for as long as a week without regard to TTL.\n\u003e\n\nWe track DNS disobeyers at Google, as we use it for load balancing (along\nwith many other large sites).\n\nI'd be kind of surprised if any large/professional ISP disobeyed the TTL\nthat badly, because it would cause frequent problems reaching popular sites\nlike anything hosted on Google or Akamai. But randomizing the DNS request\nisn't a bad idea.\n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20110803/bf787659/attachment.html\u003e",
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