Re: FrontEnd/BackEnd Vs ISA (reverse proxy)

From: Jim Harrison [MSFT] (jmharr_at_online.microsoft.com)
Date: 03/30/04 

Date: Tue, 30 Mar 2004 15:01:10 -0800

A1 - it's entirely up to you. This is called SSL-bridging and you can configure it to be either HTTP or HTTPS
A2 - Since ISA can cache some portion of the OWA pages (static gifs and such), you get a performance gain by placing ISA between the
users and the Exch FE box

Take a look at Feature Pack 1.
It incorporates some neat feature aimed squarely at Exch publishing. 

-- 
 Jim Harrison [ISASE]
 Read the help, books and articles!
 This posting is provided "AS IS" with no warranties, and confers no rights.
"FE" <frederic@esnouf.net> wrote in message news:OUxngdjFEHA.3252@TK2MSFTNGP11.phx.gbl...
Hi,
I need to implement Exchange 2003 on several sites (1 org). I have one main
site (with the internet connection) and a few remote site with a very a poor
connection (1 E2003 per site, and 1 local DC/GC).
The customer want OWA ... for all the users (from the internet not for
internal use)
I have in DMZ an ISA Server used for reverse proxy.
I must use HTTPS so I will be able to use GZIP (and the web page for
authentication)... and so compress the data transfered from the remote sites
(poor link) to the remote user (connected somewhere on the internet).
I have 2 options :
    1) use ISA as a revers proxy, and use 1 URL per remote server
(site1.owa.company.com, poorsite1.owa.company.com, ...)
    2) install a FrontEnd on the main site.
Question 1 : If I use a frontend server, how will be the dialog between the
FE and the remote BE server (with a URL such as
https://poorsite1.owa.company.com/exchange) ? HTTPS or HTTP ? If I check the
documentation about Exchange 2000 (even if I use E2003), they say that the
dialog is HTTP between the FE and the BE. If the dialog is HTTP I cannot use
GZIP which is not good.
Question 2 : what is the best in a performance point of view ? User a
FrontEnd or user ISA as a revers proxy ?
Thanks for your advices.
Regards
FE

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