Re: How to tell which interface is active on OS X ?
Re: How to tell which interface is active on OS X ?
- Subject: Re: How to tell which interface is active on OS X ?
- From: Peter Sichel <email@hidden>
- Date: Thu, 21 Mar 2002 13:06:32 -0500
You need to get the local protocol address from the connected
socket (or endpoint) since more than one interface might be
active. Both Open Transport and BSD networking provide a function
for just this purpose.
Using System Preferences or Location Manager is not a
correct solution.
Kind Regards,
- Peter
At 11:35 AM -0500 3/21/02, Matt Mashyna wrote:
I have been working on updating an ftp client implementation to run
on OS X. While in progress I was adding support for non-passive data
channels. Before the client can tell the server what port to use on
the client, the client has to know it's own address. So, to get it I
call:
OTInetGetInterfaceInfo(&info, 0);
OTInitInetAddress(&ipAddress, mPort, info.fAddress);
Works OK but then I realized that it was getting the address for the
AirPort adapter rather than the ethernet adapter. If I change the
interface number arg in OTInetGetInterfaceInfo to 1 I get the
address for the ethernet adapter.
I thought that 0 asked for the default interface. I guess this is
not the case. The location I have set up in the system preferences
prefers ethernet before AirPort. What was more amazing was that when
I ran Transmit to the same server and looked at the transcript
window Transmit also went with the AirPort interface rather than the
ethernet. That explains some of the crappy throughput I get
sometimes when I'm in an office plugged into the 100BT but close
enough to the AirPort hub to get a weak signal. My old office was
too far from the hub to get a signal through the Ti shell so this
never came up before.
Right, enough ranting. How do I determine what interface I should be
using based on the system preferences on OS X and the location
manager on OS 9.
Matt
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