Back-to-Back LAN Links

1. Ensure that both machines are connected to the same Ethernet segment or FDDI dual ring or concentrator (or back-to-back with FDDI/S).

2. Create a link on the local machine.

   Follow the procedure specified in "Setting up a Workstation Attached to a LAN".

   In the x25tool windows use the following values:

   • In the Interface Configuration window, specify LE (Ethernet), FDDI/S, or FDDI/DX for the Device item.

   • Under Logical Channel ranges, specify a two-way range that corresponds to the range used by the remote machine. If the remote machine is a SunNet X.25 7.0 machine, on that machine enter a command such as:

   % x25config -d /etc/sunlink/x25/x25params link number llc2 | grep way lcn_two_way 512-575

   In the example output above, the remote machine has a logical channel range of 512-575, the default for SunNet X.25 7.0. Specify the same range for the local machine.

3. Display the PAD Hosts Database window.

   In the x25tool base window, click on Service => PAD => PAD Hosts Database.

4. Enter information about the remote machine.

   In the PAD Hosts Database window, click on Add and enter the name of the remote machine in the Remote Host Name field and the MAC address of the remote machine in the Remote X.121 Address field. Append the value 7e (the LSAP address that designates LLC2) to the MAC address.

   If the remote machine is on the same Ethernet segment or FDDI ring, you can obtain its MAC address by entering the commands shown below on the local machine:

   local_host% arp remote-hostname remote-hostname (129.144.41.29) at 8:0:20:10:b5:a2

   In the example output above, the last field on the second output line, 8:0:20:10:b5:a2, is the MAC address. You can copy-and-paste arp output into the Remote Address field and append :7e to form a full LSAP address.

   After entering the name and address of the remote machine, click on Apply in the PAD Hosts Database Window. Click on OK to dismiss the window.

5. Start the X.25 network.

   You do not need to do this if your X.25 network is already up, and you made no changes in the Link Editor window.

6. Repeat Steps 2, 3 and 4 of this procedure on the remote machine to bring up the X.25 software on that machine.

   If this machine is running the current release of Solstice X.25, perform the steps exactly as described above. If the remote machine is running SunNet X.25 7.0 or another vendor's X.25, create an equivalent configuration.

7. In a terminal window, enter a command such as:

   hostname% /opt/SUNWconn/bin/pad remote host

   where remote host is the name of the remote host.

   You should receive a message indicating that your call is connected. If you do not, there is a configuration problem on the local or remote end.