An IPTalk configuration

The IPTalk software in K-STAR encapsulates outgoing AppleTalk packets in UDP for transmission to CAP or AUFS hosts. When it receives encapsulated packets back from these hosts, it strips off the UDP transmission data and sends it to AppleTalk nodes on its LocalTalk or EtherTalk interface.

Configuring an IPTalk interface for the gateway using the FastPath Manager allows nodes on the IPTalk network that is directly connected to the K-STAR gateway to communicate with nodes on the AppleTalk internet. When you configure for IPTalk in this way, nodes on remote IPTalk networks (lPTalk networks that are not directly connected to the AppleTalk internet) will not be able to communicate with the AppleTalk internet.

1111" All nodes on one IPTalk network must be connected to the same Ethernet cable. In addition, because the IPTalk software uses the lower-order byte of the host's IP address as a virtual

AppleTalk node address, the IP addresses of hosts on this IPTalk network must all have the same high-order 3 bytes. This is true regardless of the class of the IP network number. Note that this precludes using class C subnets as IPTalk networks.

1111" Note that using the atalkatab configuration file to configure IPTalk networks removes this restriction, and allows IPTalk traffic to be routed through IP routers to remote IPTalk networks. Configuring an IPTalk interface in K-STAR using the Fastpath Manager is recommended only when no

administrator host is present; that is, when the atalkatab file and atalkad daemon,are not available on the internet.

To use the IPTalk software in K-STAR, you define an IPTalk interface by supplying an AppleTalk zone name and net

number for the (logical) IPTalk network. When a Macintosh user selects the IPTalk network (via a zone name in the Chooser), all outgoing AppleTalk traffic destined for that network will be encapsulated in UDP. The hosts on the IPTalk network must understand this packet structure and be able to strip off the UDP transmission data to read the AppleTalk packet within;

that is, they must be running CAP or AUFS (or compatible) software. When the CAP or AUFS system returns AppleTalk data encapsulated in UDP, the gateway strips off the UDP transmission data and routes it to the AppleTalk node(s) that originated the request.

Figure 3-12 shows an example internet configuration where some hosts on an IP network are running CAP or AUFS, but there is no administrator host (running atalkad) available on the internet. The CAP and AUFS systems accept AppleTalk packets encapsulated in UDP transmission data, and form a logical IPTalk network with other AppleTalk and EtherTalk hosts.

LocalTalk network supporting Macintoshes as regular AppleTalk nodes.

IPTaik data:

IP Address of the FastPath box: 130.57.64.5 IPTalk AppleTalk zone name:

AppleTalk network number: 9~--~---~---~~---r---~

Ethernet/IP network: 130.57.64.0, subnet mask 255.255.255.0 (FFFFFFOO).

Figure 3-12. UDP encapsulation: IPTalk

This release of K-STAR uses the range of "well-known" ports (beginning at 200 rather than 768) that NIC assigned for use by the Kinetics Internet Protocol (KIP) as of April, 1988. This is compatible with the latest versions of CAP (CAP 5.0 or later) See the section on "Using the new UDP port numbers" in this chapter for more information.

In configuring the gateway, you should follow the general procedure described in Chapter 1. After connecting the gateway to a Macintosh via LocalTalk, launch the FastPath Manager, and select and open the gateway. In the main configuration dialog box,

•

Click the Reset button, then open the gateway again.

Click the Pause button.

Enter the AppleTalk configuration data; see Chapter 2.

Select K-STAR IP from the Configuration menu and double-click on the K-STAR IP listing in the

Configuration area.

Enter the IP address of the FastPath Box.

Enter the AppleTalk configuration data for the IPTalk interface.

Click OK.

Tum on the Remote Boot switch (optional).

Download K-STAR.

Click the Go button.

Save the configuration data in a file (optional).

This example uses the internet configuration shown in Figure 3-12. For your site, you should determine the proper network numbers and zone names for the gateway before you configure it.

IP Address of the FastPath box:

AppleTalk zone name:

AppleTalk network number:

130.57.64.5 IPTalk 99

After selecting Reset and then Pause, enter the AppleTalk configuration you require, as described in Chapter 2. Then proceed with the IP configuration:

1. Select K-STAR IP from the Configuration menu and double-click on K-STAR IP in the Configuration area to open the IP dialog box.

2. Enter an unused IP address on the existing IP network in the IP Address for the FastPath Box field: 130.57.64.5, then press tab.

3. Click in the AppleTalk Zone Name field and type the zone name: IPTalk, then press ^tab.

4. Type the AppleTalk network number: 99, then press tab.

Note that this AppleTalk network number must be unique;

no two networks can use the same number.

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Appl.TIlk Zone Name

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5. Click OK to return to the main dialog box.

6. Tum on the Remote Boot switch by clicking in the selection box.

7. Select Download a File. __ from the File menu and open K-STAR.

8_ Click Go to send the configuration data to the gateway.

9. Save the configuration file to disk.

At this point, Quit the FastPath Manager (using the File menu), turn off the FastPath, unplug it, and move it to its permanent location on the internet. When you bring up the gateway on the internet, launch the FastPath Manager on a Macintosh on either side of the gateway, and check the diagnostic messages in the Log window.

When you bring up the gateway on the internet, open the Chooser on a Macintosh on either side of the gateway. The IPTalk zone should appear:

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AppleTallc Zones:

IPTallc

russ terry tim

Chooser

ApplaTalk

3.4