On 16/06/17 18:33, javier perez wrote:
Hello Matus,

You are right, the thing is that our clients are not going to open any other
port than 20 and 21 for security meassures (or lazyness).

FYI: The "for security" argument is bogus because;

a) allowing any random client to determine their own arbitrary port number(s) is strictly worse for security than having your control point (Squid) select the port, and

b) limiting that client-selected port to 20/21 makes the data between client and Squid go over a port which is more easily predicted and therefore interceptable by passive attack.

Amos

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