[dns-operations] Always replying to UDP requests with TC=1, good practice or not

Mukund Sivaraman muks at isc.org
Sun Oct 18 16:39:05 UTC 2015


On Sun, Oct 18, 2015 at 10:02:12PM +0530, Mukund Sivaraman wrote:
> > Is it a good idea?
> 
> No, I don't think so. There is lot of talk these days suggesting
> directly using TCP for DNS due to all the issues UDP has.

BTW, note that replying with TC=1 triples RTT over UDP as a resolver
today will first try UDP (1 roundtrip), then noticing TC=1, retry with
TCP (+2 for first data).

		Mukund
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