At 3:34 PM -0500 1/26/05, Eagle wrote:On Jan 26, 2005, at 15:20, Eagle wrote:Once you select a server with AppleTalk it will attempt to connect to the server via IP if it can. If the server isn't serving on IP then it simply uses AppleTalk. If the server reports it is using IP then the client will attempt accessing the server via IP. If it can't be reached there will be a delay while it attempts it. If it can't connect via IP it reverts to AppleTalk. This can happen if the two computers are connected by AppleTalk but not IP (such as using LocalTalk without MacIP or one is using dial up instead of Ethernet for IP).
But AFP is not using AppleTalk over IP.
So, hmm... what exactly does that "AppleTalk" checkbox in the OS X Network preference panel do anyway? Is that to turn on AppleTalk over the selected network interface?
I don't mean to reply to my own email, but a clarification is in order.
Does that checkbox turn on AppleTalk over the selected network interface, versus just using AppleTalk over IP* on the selected interface?
* - "AppleTalk over IP" is BKA "AppleTalk/IP" correct?
What is the benefit of using AppleTalk on the interface versus just AppleTalk/IP on the interface? Is it that AppleTalk turns on the network broadcasts which help Chooser to know the available servers on the network? Is there more than that?
AFAIK there is no AppleTalk over IP in OS X.
I don't know enough to contradict this statement, but I wonder if it is true. OS X-to-OS X is likely using Rendezvous and AFP. As I said, my System 7 box can connect to my OS X box if I use the "Server IP address" button when the AppleTalk checkbox is unchecked in OS X. Isn't that AppleTalk over IP?
AT over IP was used at one time to connect two separate AppleTalk networks using the Internet or an IP connection that wouldn't support AppleTalk.
This totally makes sense to me.
If you configure an interface for using IP and you check the AT box you are configuring it to use IP and AT, not IP over AT nor AT over IP. They are two distinct network protocols having nothing to do with each other normally.
OK, so checking the box configures it to use AppleTalk over the selected interface - that is, AppleTalk over Ethernet or AppleTalk over wireless or whatever. No problem. Makes sense.
What makes me wonder is, like I said, my System 7 clients can still connect regardless of whether that box is checked. It's just that if I don't check the box I have to specify the IP address in Chooser, but if the box is checked Chooser sees my OS X box. If the box is unchecked and I specify the IP address in Chooser, I guess I'm using AppleTalk/IP correct?
Put another way: if AppleTalk isn't active on a server, yet I can still contact that server (via IP address), how is it working? :)
OK, hmm... now that I think about it I think I should start some tcpflow or tcpdump sessions and just answer my own questions. ;)
The AppleShare over AppleTalk/IP is a common erroneous idea largely due to the confusion stemming from the use of "Apple" in much of Apple's technologies.
They sure do like to put "Apple" in the names of their technologies!
Thanks - I'm still trying to figure it all out. :)
Eagle
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