Using NAT with a VIP ? (2 differents subnets)

[dattik]

Hello,

I'm a beginner with pfsense, and after several researches; I didn't find any solution for my problem, so I come here…

Here is my case :

I created a personal lab with some ESXi..

I have 2 networks :
Network 1 = 192.168.2.0/24
Network 2 = 192.168.100.0/24

• Each network have a pfsense (.254) for the virtual machines.
• A VPN site-to-site have been made between this 2 networks (ping are OK).

Concerning the hosts :
pfsense (Network1) : 192.168.2.254 (with also a WAN interface)
mail-server1 (Network1) : 192.168.2.120
mail-server2 (Network2) : 192.168.100.130

• The mail servers are currently in Active/Passive state (192.168.2.120 is UP, and 192.168.100.130 is DOWN), so if "mail-server1" shuts down, the IP of "mail-server2" becomes active.
• I also have some others hosts in the Network 1.

Here is what I want :
I though about creating a VIP in Network1 like 192.168.2.140 (that will deserve both of my internal mail servers : 192.168.2.120 and 192.168.100.130).
And then, I would like to make NAT rules to redirect some trafic (https and mail) TO this VIP, so the trafic will be always redirected to the active host.

Unfortunately, I don't know how to do that.. :/

Is there a way to achieve what I want to do ?
Or another solution with pfsense ?

Maybe I'm not explaining the case very well, so in case, here is a schema of my need :

Thx for reading !

[dattik]

Problem Solved, I used "haproxy" package of pfsense and it works as needed !