how to manage using ISA behind a leased line

fist of all happy new year to everyone especially to those who are
managing this helpful list

i already asked one week ago such a question but did'nt succeeded to have
the right answer, so i formulate again my problem

it is a small company with 6 boxes center of paris (site A 192.168.2.0)
and another office with 10 boxes (site B 192.168.1.0)

both offices are connected through a leased line with cisco routers 800
having adresses 192.168.2.1 for site A and 192.168.1.1 for site B

a win 2K cpd with ad is in site B and another in site A 192.168.2.2

each box in each site has to connect to shared applications ou folders in
one or the other site. until now everything was working fine

to give access for users to internet and be able to use outlook express
for internet mail we just installed ISA on the csd of site A : 192.168.2.2
waiting for better time to use another independant server
we are using a bewan router on adsl line ok

everything working fine for site A with securenat clients (http, smtp,
pop3)even able to use shared folders on site B using add -p routes to site
B

but we dont't know what to do for site B

on the internal NIC of ISA 192.168.2.2 we can't include a gateway on the
router of site A 192.168.2.1 , accordingly the boxes of site B can't
connect to the shared folders or applis running on ISA box.

all boxes of site B have the router of site B as gateway 192.168.1.1 but
this does not help to be securenat clients for ISA on site A

applis don't work anymore and internet is useless

i am sure for most of you this routing problem should be quite easy to
solve and i just see on message also on this list nearby mine but noone
gave idea and this is why i ask again

thanks for any idea



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