How is NetNameResolver choosing the interface to return an IP address from?

In Cobalt this is a problem. You need the right address to connect to other
spaces. Cobalt won't let you enter it by hand, so you are at the mercy of
its guessing the correct interface.

NetNameResolver localAddressString

executed in Workspace produces the IP from my fw0 interface, which is
useless. I need it to look at ppp0.

Can it be told which interface to look at?
How does it choose?

Chris
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