[c-nsp] NAT

[madunix]

I have a RAC 2xnodes (CRS) setup behind a NAT Firewall (IP nating 1:1), when
the clients connect to DB they only connect to first IP and not using
the second IP. How should I configure my RAC/NAT/TNSnames to give the
clients the option to connect both IP's inorder to have Load balance?
since am not able to get the clients to swap between the 2x nodes

The NAT is made on a ROUTER

R1#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3660-IK2O3S-M), Version 12.0(7)XK1, EARLY
DEPLOYMENT RELEASE SOFTWARE (fc1)
TAC:Home:SW:IOS:Specials for info
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Fri 17-Mar-00 19:37 by phanguye
Image text-base: 0x60008900, data-base: 0x611AC000
ROM: System Bootstrap, Version 12.0(6r)T, RELEASE SOFTWARE (fc1)
ROM: 3600 Software (C3660-IK2O3S-M), Version 12.0(7)XK1, EARLY
DEPLOYMENT RELEASE SOFTWARE (fc1)


on the clients:
node=
   (DESCRIPTION =
   (FAILOVER=ON)
   (LOAD_BALANCE=YES)
   (ADDRESS = (PROTOCOL = TCP)(HOST = 10.5.1.X)(PORT = 1521))
   (ADDRESS = (PROTOCOL = TCP)(HOST = 10.5.1.Y)(PORT = 1521))
   (CONNECT_DATA =
   (SERVICE_NAME = CO)
   (FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC))
   )
   )

 on the server:
########## Public Network ##############
10.4.1.X       node1
10.4.1.Y       node2

########## Virtual IP Address ########
10.4.1.XX      node1_vip
10.4.1.YY      node2_vip


regards,
madunix