I am no good at explaining this so I will just give a link to wikipidea and a write up of what DHT is.
LInk->
http://en.wikipedia.org/wiki/Distributed_hash_table
And having DHT enable makes you less secure and most private ask that it be turned off because of this.
*A DHT enabled scenrio*
I wouldnt want to be downloading a file at a private site were you have to keep a ratio and then having the DHT enabled client allow a public tracker to hook up and join the the swarm and basically be taking some of the upload ratio that was meant to be for the private site were ratios mean something and the actual file was gotten from.
*A DHT disabled scenrio*
you have DHT disabled and you go to private site A and grab a file and now you dont have to worry about other people who are not members getting your info and there lies the "being more safe" factor since only the actuals member of the private site are allowed to connect to you which is what private sites are about right.
Thats two reasons why disabling DHT is safer imho.
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