question: source address on interface w/ aliases?

[Brian Reichert]

I've had an expectation violated recently, and wanted to research
whether my expectation was grounded in reality:

  Given an interface with a primary IP, and one or more aliased IP
  addresses:

  When a process opens a connection to another host, which IP address
  will be chosen as the source address?

Steven's just says 'the kernel chooses the IP address and port'.

My expectation was that the primary IP address would be used.

Is my expectation valid?  Is there a spec that describes this, or
is it up to an individual OS to do whatever it wants?

(I'm sorry to pester this list, as this question isn't actually
specific to FreeBSD...)

I'm more than willing to do my own research, but a suggestion of
useful buzzwords would be appreciated as well. :)

Thanks for your time...

-- 
Brian Reichert				<reichert at numachi.com>
37 Crystal Ave. #303			Daytime number: (603) 434-6842
Derry NH 03038-1713 USA			BSD admin/developer at large