[Tsvwg] Re: [e2e] e2e principle..where??....

John Day day at std.com
Wed Jun 6 10:22:44 PDT 2001

At 11:59 -0400 6/5/01, Manish Karir wrote:
>I think this is where I'm confused, apparently people have no
>problems with caches(or proxies when they are used a caches).
>However, caching proxies do the same thing...they terminate TCP connection
>from client to them and then build another one from them to server(on cache
>miss)... therefore they too are not e2e.
>Infact TCP connection splitting is as common in todays networks as caches
>are...but no one seems to be protesting cache deployment??

Someone pointed out an aspect of this in a latter message but let me 
make the point here:  User - cache connection and a user - website 
connection are indeed, as you point out, the same thing.  But the 
cache to website connection is a different application protocol with 
different uses. All 3 are e2e. But the user to cache to website is 
not e2e any more than a telnet connection to an application to an FTP 
client that then moves a file.
>But I think what really answers my question is what somebody said in an
>email..."if something is e2e that does'nt necessarily make it good...and
>if something is not e2e that does'nt necessarily make it bad..."
>basically e2e is but ONE argument in system design, it is quite
>likely that other factors can outweigh e2e arguments...

Correct.  And while not often, one person's end is another's 
intermediate, i.e. ends for TCP, aren't necessarily ends for SMTP.

Take care,

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