Proper IP address for PC to Iseries connection

Just when I thought I was done.

I've a java application on a PC which waits for and processes keyed data
queues entries placed in the queue by an AS400 application. The "key" being
the IP address of the PC running a CA session as retrieved by RPG using the
API QDCRDEVD.

Until today I worked on this off site thru a Sonicwall VPN and the java app
retrieved the same IP address as the RPG app.

While connected locally, it turns out that the IP address the java app
retrieves using "InetAddress.getLocalHost" does not retrieve the IP address
on my local nic card. Instead it is retrieving the address of the my VPN
driver that is installed on my PC. The annoying part is that the RPG app
does retrieved the IP address of the local nic card.

My observation is that the VPN IP address is the culprit but only because it
is the 3rd IP address available as viewed by running IPCONFIG /ALL in a
command window. The 2nd IP address is my wirecard which is shut off. I think
my observation is correct because if I physically disable the VPN driver
(and hence the virtually IP address assigned), then the java app returns the
local nic card IP address.

I think "InetAddress.getLocalHost" is reading them all and returning the
last one encountered

I need to roll this app out to hundreds of users on multiple AS400 boxes and
I don't want to have to have anyone manually assign some unique identifying
code for each PC session which in turn would have to be available (and
known) to the RPG application. Nor do I want a PC user to have to shut off
any physical or virtual nic addresses.

Any suggestions for an approach. This worked so seamlessly until this AM.

What I thought of doing (because I found java code to do it) is to retrieve
ALL the IP addresses on a PC and then try each of them as the key on the
read of the keyed data queue.