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I thought DNS lookup was supposed to use a random source port above 1024?

April 26, 2017DNS lookup port source

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I thought DNS lookup was supposed to use a random source port above 1024?

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In practice, your average DNS client will use a non-reserved port. However, a lot of implementations use a source port of 53. In any case, the NAT issue is completely separate because it completely changes the entire ‘socket’ (IP address + port combo).