How does an application like Safari decide which network port to use
(e.g. Airport or VPN)? Is there a way to modify this decision based on
network address?
Safari does not care which network interface its traffic flows
through: it (like most other applications) leaves that decision to
the normal IP routing infrastructure in the kernel.
For instance, I want Safari to use the proxy settings associated with
my VPN connection when it sees an address destined for the VPN network
port. However, I don't want to send all traffic through the VPN
connection.
You don't have much choice here. If your network setup is such that
you have two paths to a given host, one through the VNP interface and
one through another interface, the routing algorithm will pick one
based on both the source and destination addresses in the packet to
be sent.
You may be able to set up routing information in a way that forces
the system to send packets where you want them, but it is not
normally considered an easy task.
I was poking through scutil dictionaries this morning, but didn't find
anything that solved this problem.
Yup; SystemConfiguration does not address this problem (at least, not
directly).
What does your network setup look like?
Regards,
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Institute for General Semantics
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Experience is what you get
when you don't get what you want.
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