particular DNAT

["famleone@tin.it" <famleone@tin.it>]

Hi,

I have a firewall netfilter + iptables and the configurations is:

       adsl---------------------____ ---------------------dmz ----web
                                  |        |
                                  | FW  
|                                                       
                                  |____|
       
hdsl---------------------         ----------------------- lan

and for 
the server web i have a DNAT from hdsl on dmz

   iptables -t nat -A 
PREROUTING -p tcp -d ip.public.hdsl --dport 80 -j DNAT --to $serverweb:
80

but now I need a DNAT similar for the adsl

   iptables -t nat -A 
PREROUTING -p tcp -d ip.public.adsl --dport 80 -j DNAT --to $serverweb:
80

for the same server web, but now the response from server web go 
out from the hdsl line (the defualt gw) and it dont work.

In other 
word I want to forward the connection to the server web with 2 ip 
public: ip.public.adsl and ip.public.hdsl but the response pass only 
from the hdsl line. What can i do to distinguish the 2 different ip 
public to determine the correct gw ?

For me the ipt_ROUTE  is part of 
the solutions of my problem!

cfh