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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">there is in fact a move afoot to allow long-lived tcp/53 connections, by negotiating session parameters. if this is done carefully and deliberately, then a tcp-serving dns server can be engineered to support the same volume of connections and transactions as a modern tcp-serving http server. it just can't be done without negotiation, since existing tcp-serving dns servers don't know what they can do, and it's often very little.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">http://datatracker.ietf.org/doc/draft-ietf-dnsop-edns-tcp-keepalive/</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">this is vital for the dns privacy work, which would like to use tls not dtls.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">noting, dns-over-http has persistency today. there's code and spec at:</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">https://github.com/BII-Lab/DNSoverHTTP</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">i operate an open dns-over-http rdns server at proxy-dns.tisf.net, fwiw.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">vixie</p>
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