What are the main advantages of using the IP Spoofing options in OLT?

We are currently re-thinking our deployment of OATS (currently only 2 agent machines) and I was wondering about the benefits of using IP spoofing. Has anyone got any experience of using this feature (examples of when it's required)?
What sort of scenarios does tests coming from multiple IP addresses assist with (I can think of issues with load-balancing depending on how this is configured)?
I'm aware of the issue with ephemeral port exhaustion (mentioned in the OATS release notes) but would IP spoofing help?

The "Known Problems, Limitations and Workarounds" section of the OATS Release notes usually mentions the following (which I've seen referred to as ephemeral ports before):
Problem: Load tests on agent machines running Windows XP or Windows 2003
may experience TCP port exhaustion during load testing. When too many TCP
ports are opened on the agent machine, virtual users may fail with errors such as:
java.net.SocketException: No buffer space available (maximum connections
reached?)
and
The attempt to connect to the server XXXXX on port NNNN failed. Comparable
WinInet error code: error 12029: ERROR_INTERNET_CANNOT_CONNECT. Caused by:
java.net.BindException occurred. Error Message: Address already in use: connect
Resolution: By default, Windows XP and Windows 2003 only allow 5000 TCP
ports. This number should be increased according to the steps here:
http://msdn.microsoft.com/en-us/library/aa560610(v=bts.20).as
px
In Windows Vista and Windows Server 2008, the default port range is increased
from 5,000 to about 65,000 ports:
http://support.microsoft.com/kb/929851/

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