[e2e] FTP data port

[David P. Reed]

At 03:10 PM 2/26/01 -0500, John Day wrote:
>The application layer should never pass around IP addresses, any more than 
>a program should pass around absolute memory addresses between different 
>programs.

Probably a side issue, but I disagree that this is a general 
principle.  Any application program that deals with multiple foreign 
entities needs to tell the other entities about each other.  There is no 
means for doing so other than IP addresses.

The only situation where IP addresses need not be used is where there are 
exactly two entities, self and other.

I can agree, however, that one should not pass around IP addresses when it 
isn't necessary (i.e. when the task can be accomplished without passing 
around IP addresses.)

- David
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