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@@ -1,3 +1,24 @@
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+In -dot mode, if, after the TLS connection may become disconnected, the
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+redial fails to connect, it results in "operation on closed connection"
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+errors and a useless connection up until idleTimeout (2 to 4 minutes
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+later), when the stream ends. For example, see
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+1-12c59bf6/quad9_dot_1.dnstt.client.log from the 2021-08-02 dnstt-tests
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+performance measurement:
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+ 2021/08/02 10:00:49 recvLoop: read tcp 10.0.1.2:34788->9.9.9.9:853: read: connection reset by peer
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+ 2021/08/02 10:00:49 sendLoop: write tcp 10.0.1.2:34788->9.9.9.9:853: write: broken pipe
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+ 2021/08/02 10:00:50 tls.Dial: dial tcp 9.9.9.9:853: connect: connection refused
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+ 2021/08/02 10:00:50 recvLoop: read dummy dummy: operation on closed connection
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+ 2021/08/02 10:00:50 send: write dummy dummy: operation on closed connection
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+ 2021/08/02 10:00:52 send: write dummy dummy: operation on closed connection
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+ ...
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+ 2021/08/02 10:03:02 send: write dummy dummy: operation on closed connection
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+ 2021/08/02 10:03:06 send: write dummy dummy: operation on closed connection
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+ 2021/08/02 10:03:09 end stream cde4ab0c:3
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+To fix this, we could be more persistent in redialing, and/or cause a
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+redial failure to cause the stream and session to terminate immediately.
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+We already close TLSPacketConn; we should perhaps also terminate
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+DNSPacketConn.sendLoop.
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+
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Randomize the source port for each query in plain-UDP mode. Currently we
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create a socket with net.ListenUDP and use it for all queries, which
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means all queries have the same source address. ValdikSS reports that in
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David Fifield