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AppleTalk over IP Tunnel adev
The IPTnnl adev allows a Macintosh with MacTCP 2.0.2 (or later) and an
external IP connection (via Ethernet, SL/IP or PPP) to access remote
AppleTalk services using an AppleTalk encapsulation system that is
compatible with the UNIXª AppleTalk Router (UAR) "tnnl" interface.
IPTnnl can be used to connect Macintoshes to a UNIXª host that is
running UAR or to other Macintoshes which also have IPTnnl installed
(in which case the use of UAR is not required).
Notice
Copyright 1995, The University of Melbourne. All rights reserved.
Permission to publicly redistribute this package or to use any part
of this software for any purpose, other than that intended by the
original distribution, must be obtained in writing from the copyright
owner. This software is supplied "as is" without express or implied
warranty. May not be resold. Bugs to djh@munnari.OZ.AU
Portions of this user documentation may be reused for localised
documentation providing that the above notice remains intact.
Shareware
Please note that this adev is released under the shareware system.
The cost for personal use on a single Macintosh is US$10 or the
approximate equivalent in your local currency. The fee for use on 2-5
Macintoshes for academic or personal use is US$25. A site licence,
or the fee for use in a commercial environment may be negotiated by
sending email to uar@munnari.OZ.AU or by writing to the address below.
Please send shareware payments via cheque or postal order to
IP Tunnel ADEV
Department of Computer Science
The University of Melbourne
221 Bouverie Street
Carlton 3053
Victoria
Australia
ARNS
The IPTnnl adev should normally be used to provide a semi-permanent
AppleTalk connection to Macintoshes on IP-only subnets, that is, where
an EtherTalk connection is not available. It is not designed for casual
connections; for this purpose you should use the IPRemoteAT adev and UNIX
server from the ARNS package (see below).
Network Control Panel
IPTnnl is a client of the Network Control Panel. If your Macintosh does
not have it already, Network must be installed from the 'Network Software
Installer' disk. The latest version of the NSI disk is available via
anonymous FTP from
ftp.support.apple.com
in the directory
apple_sw_updates/US/Macintosh/Networking & Communications/Network Software Installer
as the file
NSI_ZM-1.5.hqx.
You will also need a version of DiskCopy to create an 1400k disk from this
image file. The use of system software version 6.0.5 or later is highly
recommended, but System 7 is preferred because of the amount of system
heap memory required.
The Network Control Panel lists the available alternate AppleTalk
connections. In this example, the IPTnnl adev icon is highlighted
indicating that it is currently active:
To change the network connection, click on the icon that represents the
service to be used. An alert box will appear requesting confirmation of the
change ...
Since there is no Obviously button, click on OK.
Configuration
Selecting the IPTnnl adev icon in the Network Control Panel allows the
link details to be configured. Note: after the initial configuration,
selecting the icon does not display the dialog box unless the SHIFT key
is simultaneously depressed.
The Node field is the AppleTalk node number for this Macintosh.
Node numbers are chosen (at random) by the UAR or AppleTalk network
administrator and are uniquely assigned to the IP addresses of
Macintoshes running IPTnnl or UAR "tnnl" interfaces. Valid node
numbers lie in the range 1 - 253.
The Network field is the AppleTalk network number assigned to a UAR
"tnnl" or zero for IPTnnl connected Macintoshes where UAR is not used
(must be zero for this case, you have been warned!).
The UDP Port field is the service port assigned to UAR "tnnl"s (as
set by a tnnl entry in the file /etc/services), or chosen by the
local network administrator. The default value is 9115.
The Node and Peer IP Address scrolling fields contain the mapping
between AppleTalk node numbers and the IP addresses of other
Macintoshes running IPTnnl or UAR "tnnl" interfaces. The up and
down arrows scroll through the 253 available addresses. Holding down
the SHIFT key scrolls by 10 at a time. At least one participating
machine must have all peer address mappings set by hand (see below).
The Configuration Server field contains the IP address of a Macintosh
running IPTnnl or a UNIXª host running UAR that can download
configuration settings to the local Macintosh when the Load button
is selected. Requests for configuration data from Macintoshes whose
IP address is not already listed as a peer are silently ignored.
Note: The UDP Port field value used by the server must be
entered before configuration data can be downloaded.
The Connect button saves any IPTnnl configuration changes and
completes the change in network connection. The Cancel button
discards any changes and returns the network connection to the
previously selected method.
MacTCP
IPTnnl requires MacTCP version 2.0.2 or later (the support in version 1.1
is broken). For reasons that should hopefully be obvious, MacTCP should be
configured to send IP packets over Ethernet, SL/IP or PPP rather than via
LocalTalk or EtherTalk.
The IPTnnl adev contains code to adjust AppleTalk timeouts for slow IP
links but this is only effective if the MacTCP mdev (SL/IP or PPP etc.)
correctly sets the line speed (in the LAPStats.ifSpeed field). It is not
currently known which of the existing mdevs comply with this requirement.
Availability
The IPTnnl adev and this document are available via FTP from munnari.OZ.AU
as the file
mac/iptnnladev.1.0.sit.hqx.Z
To change the network connection, click on the icon that represents the service to be used. An alert box will appear requesting confirmation of the change ...
Since there is no Obviously button, click on OK.
The Node field is the AppleTalk node number for this Macintosh. Node numbers are chosen (at random) by the UAR or AppleTalk network administrator and are uniquely assigned to the IP addresses of Macintoshes running IPTnnl or UAR "tnnl" interfaces. Valid node numbers lie in the range 1 - 253. The Network field is the AppleTalk network number assigned to a UAR "tnnl" or zero for IPTnnl connected Macintoshes where UAR is not used (must be zero for this case, you have been warned!). The UDP Port field is the service port assigned to UAR "tnnl"s (as set by a tnnl entry in the file /etc/services), or chosen by the local network administrator. The default value is 9115. The Node and Peer IP Address scrolling fields contain the mapping between AppleTalk node numbers and the IP addresses of other Macintoshes running IPTnnl or UAR "tnnl" interfaces. The up and down arrows scroll through the 253 available addresses. Holding down the SHIFT key scrolls by 10 at a time. At least one participating machine must have all peer address mappings set by hand (see below). The Configuration Server field contains the IP address of a Macintosh running IPTnnl or a UNIXª host running UAR that can download configuration settings to the local Macintosh when the Load button is selected. Requests for configuration data from Macintoshes whose IP address is not already listed as a peer are silently ignored. Note: The UDP Port field value used by the server must be entered before configuration data can be downloaded. The Connect button saves any IPTnnl configuration changes and completes the change in network connection. The Cancel button discards any changes and returns the network connection to the previously selected method.
