> Below I have done s/iMAC/iMac/g on my original text to hopefully
> irritate purists less.
>
> On Apr 7, 4:18 pm, J.J. O'Shea wrote:
>>> Hi,
>>
>>
>>> I know my way around FreeBSD, but I'm anxious not to do anything so
>>> drastic to my iMac that I have to spend ages fixing the problems I
>>> might cause.
>>
>>> At present I use my airport to connect to my DSL wireless router on
>>> the default subnet.
>>
>>> What I want to do is to set up a second interface in an additional
>>> subnet on my iMac's airport interface. To this I will wirelessly
>>> connect a slimdevices SB3. Thus I can stream music from iTunes to SB3
>>> to Hi-Fi on a private subnet. This also means that if I lose my DSL
>>> router I can still play music.
>>
>>> In FreeBSD terms, I'd use
>>
>>> ifconfig en1 alias blah blah
>>> route add blah blah
>>
>>> and then check things like
>>
>>> sysctl net.inet.ip.forwarding
>>
>>> to ensure I don't use my iMac as a router, then record the changes in
>>> the appropriate config files and reboot.
>>
>>> I'd appreciate pointers to where I can find a HOW TO for doing this
>>> sort of thing on an iMac.
>>
>>> Thanks in Advance,
>>> Adam Nealis.
>>
>> Step 1: work out your subnet(s).
>>
>> Step 2: apply the subnet(s) to the two interfaces with either the command
>> line or the GUI (System Preferences/Network). You should NOT have to reboot.
>
> I would like to use the GUI, if only because that way I know the
> config change will survive system restarts (the reason for the
> reboot). And from what you say, it appears the GUI can be used for
> that sort of thing. From the cursory look I gave System Preferences/
> Network earlier today it was not obvious I could.
You didn't say which version of MacOSX. I'm going to describe
10.4.9. Older versions may or may not behave this way.
System Preferences -> Network
Show: Network Port Configurations (this is a pop-up menu)
Select your Airport port entry
Click Duplicate
Give the new port a new name
Show: Your New Named Airport port (the same pop-up menu)
TCP/IP Tab
Configure IPv4: Manually (another pop-up menu)
Now configure the TCP/IP settings you want
You now have a multi-homed Airport setup.
Bob Harris
> But I'm more comfortable with the command line and I don't know what
> the GUI stuff does behind the scenes, hence my interest in a HOW TO.
>
>> Step 3: turn on Internet Sharing, using System Preferences/Sharing and the
>> two interfaces you have selected in Step 2.
>
> Ah. I very well could have missed that step for a while.
>
>> And, btw, it's iMac, not iMAC. MAC is Media Access Control.
>
> So it is. I hang my head in shame.
>
> Thanks for the help.
