"Type of network service (CLNS/CONS/RFC1006)?"

    If you want to use Connectionless Network Service (CLNS), enter
    CLNS. If you want to use Connection Oriented Network Service
    (CONS), enter CONS.  If you want to use RFC1006, enter RFC1006.

    o  CLNS NETWORK SERVICE

       There are two forms of the CLNS network service. Both forms
       support only one class of transport protocol: class 4.

       1. CLNS with Internet/ES-IS

          Any transport connection can use CLNS with Internet/ES-
          IS. The communicating end systems may be on the same
          subnetwork, or on different subnetworks. This network
          service is provided by the implementation of the ES-IS (end
          system to intermediate system) Internet routing protocols,
          which route packets from the end system to an intermediate
          system on the same subnetwork. The intermediate system will
          ensure that packets reach their final destination. Two end
          systems that implement ES-IS on the same subnetwork may
          communicate without an intervening intermediate system.

       2. CLNS with Null Internet

          A transport connection may use CLNS with Null Internet only
          when the two end systems are on the same 802.3 LAN. This
          network service is provided by the inactive subset of the
          Internet protocol. No intermediate system is involved in
          the network connection.

    o  CONS NETWORK SERVICE

       A transport connection can use CONS when the underlying
       network connection is an X.25 connection. This type of network
       service is provided by the X.25 software in the DECnet-Plus for
       OpenVMS product.

       CONS supports transport connections using any class of
       transport protocol (that is, class 0, class 2, or class 4).

       The underlying X.25 network connection can be:

       -  A connection between two systems attached to an X.25 Packet
          Switching Data Network (PSDN), either directly or via an
          X.25 gateway

       -  A point-to-point connection using the LAPB protocol as the
          data link protocol

       -  A direct connection between two systems on the same IEEE
          802.3 LAN, using the LLC2 protocol

       In each of these cases the two end systems are on the same subnetwork.

    o  RFC1006 NETWORK SERVICE

       The network service type RFC1006 tells the OSI transport to
       run over the TCP/IP protocol stack. The network service type is
       specified in an OSI Transport template.

       When using DECnet applications over RFC1006 the OSI transport
       template osit$rfc1006 is used for the inbound connection.
       For outbound connections, the default template is used.