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- Randomize the source port for each query in plain-UDP mode. Currently we
- create a socket with net.ListenUDP and use it for all queries, which
- means all queries have the same source address. ValdikSS reports that in
- regions of Turkmenistan, UDP associations that use the same 4-tuple are
- blocked after a few seconds.
- https://ntc.party/t/topic/475
- My idea for this is to create a new PacketConn abstraction that creates
- a bunch (≈100) of goroutines that each do a single query at a time,
- creating a new socket for each one and waiting for a response on the
- same socket up to a timeout. Similar to HTTPPacketConn and its multiple
- instantiations of sendLoop.
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