LVS trhough firewall with IP Tunneling or Direct Routing

[Elton Ramos Carvalho <elton.lista@xxxxxxxxxxxxxxx>]

Hello,

I have this network diagram....
                                                                        
               H.H.H.H
                           eth0                eth1                   
           Z.Z.Z.Z  
(INTERNET) ---------- FIREWALL---------SWITCH---------(DMZ)
where....

eth0 and eth1 is valids IP address in diferents subnets

eth0 X.X.X.X/248  ...firewall and router subnet
eth1 X.X.X.X/240   ....my dmz

H.H.H.H smtp1
Z.Z.Z.Z   smtp2
      

I want...
.....a VIP address that respont to my 2 mail servers(duh)...
.....that my FIREWALL  act as the DIRECTOR but using "direct routing" or 
"ip tunneling" (with nat this works fine).
    Is it possible?
    I did some tests and when the datagram back to source IP, it stop 
in eth1 with "martian source" error.
    >>>>Feb 23 17:54:50 marlin kernel: martian source Y.Y.Y.Y from 
X.X.X.X, on dev eth1
    where Y.Y.Y.Y is a ADSL server and X.X.X.X is my VIP in one of my 
mail servers.
   

I will apreciate any help
Tks in advance

Elton Ramos Carvalho