Our stub resolver intentionally doesn't do edns or tcp, for several reasons.
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again no, edns has nothing to do with latency.
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Yes it does. 1. You have to query for support. 2. Fragmentation + packet loss = awful.
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1. no 2. no unless you want more than path MTU, if you stick with 1280/1452 you're good.
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1. Yes; a stub can't assume edns. There are countless isp nameservers of various brokenness.
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2. I've seen links with MTU=576; this is likely why DNS chose 512 as limit.
End of conversation
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