use private ip on "wan ip" cluster

[tuco76]

hello,

we test cluster xl on R62 with SPLAT with isp redundancy. We have a public adress range and we want to preserve free ip.

We configure private ip on module with private ip gateway who don't exist and the virtual ip cluster is public who communicate with router.

Lan communicate with wan, but module don't access to Internet and we have a problem for client VPN.
Creation site is ok but we can't join policy server and communication is aborded.

Is someone have experience about ip configuration ?
Thanks