11.2.2 NAT forwarding
In this scenario, we use the same two Web servers that we worked with in 11.2.1, MAC forwarding. However, we use a Load Balancer in a different network, which is installed on a Solaris system. We also add a third Web server, which is in a geographically remote network and in a different domain.
We now use Network Address Translation (NAT) as the forwarding method instead of MAC forwarding. We assume an unconfigured Load Balancer for this scenario. So if you have set up MAC forwarding and plan to use the same machine, then you need to delete the existing configuration. You also need an additional IP address in the same subnet as your cluster address, which is used as the return address.
Table 11-2 lists the host names and IP addresses of our nodes.
Table 11-2
Node/cluster Host name IP address Web server node 1 srvb501.torolab.ibm.com
9.26.126.120 Web server node 2
srvb504.torolab.ibm.com
9.26.127.157 Web server node 3
m106958f.itso.ral.ibm.com
9.42.171.83 Load Balancer
pistons.torolab.ibm.com
9.26.52.215 Load Balancer cluster
nat1.torolab.ibm.com
9.26.52.154 Load Balancer return addr.
(nat2.torolab.ibm.com)
9.26.52.156
Host names and IP addresses for NAT forwarding
When using Solaris on the Load Balancer machine, install Load Balancer as described in 8.6, Install Load Balancer.
Important: On Solaris 9, we had to install Version 6.0.2.58 of Load Balancer to prevent the machine from crashing when accessing it from a remote browser after completing the configuration. Version 6.0.2.58 can be directly installed on top of the 6.0 license file as described for Version 6.0.2 in 8.6, Install Load Balancer. If you plan to install it on top of an existing installation, you need to remove all packages of the existing installation except the license first.
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