Correct Chris! I have created float IPs for every VLAN and those float ips are the DG for the back end systems...
and the problem is that when server A in VLAN ACS tries to talk to server B in VLAN NAS it just cant....
I though this should be pretty straight forward since all routes are directly connect to the BIG-IPs but for some reason it is not...
I created SNAT for all VLANS with no possitive effect...
This is an extract of the routing table:
root@F5-LTM1(Active)(tmos.net) show route
Net::Routes
default gw 201.192.246.X static
127.1.1.0/24 interface tmm0 connected
127.10.0.0/16 interface tmm_bp connected
172.31.39.0/26 interface ICE_internal connected
172.31.39.64/26 interface MNG connected
172.31.39.128/27 interface ACS connected
172.31.39.160/27 interface NAS connected
201.192.246.X/28 interface Gestion_CPEs_RAI_Prod connected
201.192.246.X/28 interface Gestion_CPEs_RAI_Test connected
thanks for your response!