Other networking resources

SCO OpenServer networking services also support the following networking protocols and software:

• The Internetwork Packet Exchange (IPX) protocol provides a connectionless datagram service similar to UDP except that the data packet size is limited to 500 bytes. IPX also plays a similar role to the IP protocol in TCP/IP by providing a message service for modules above it in the protocol stack, including SPX.

  The Sequenced Packet Exchange (SPX) protocol is a connection-oriented service similar to TCP except that it does not support a configurable send and receive window size; an acknowledgement is required for every packet that is sent.

  For testing IPX/SPX network connectivity, the command nping(PADM) is available. This provides similar information to that provided by the TCP/IP command ping(ADMN).

  For more information about IPX/SPX, see ``IPX/SPX''.
  

• SCO Gateway for NetWare software re-exports filesystems mounted on Novell^® NetWare^® servers. Its operation depends fundamentally on the configuration of IPX/SPX. For more information, see ``Accessing NetWare servers with SCO Gateway for NetWare''.

• NetBEUI is another type of protocol stack similar to TCP/IP and IPX/SPX. It is included with Microsoft^® LAN Manager for SCO^® Systems.

• The NetBIOS interface allows applications such as LAN Manager to send messages over TCP/IP.

• SCO OSI is a protocol stack that implements the Open Systems Interconnection 7-layer model.

Like the TCP/IP protocol, all these networking resources depend on the availability of sufficient STREAMS and CPU resources, and the performance of the network and network adapter cards. See ``STREAMS resources'' for more information. You can use the netstat or ndstat commands to examine the number of errors and packet collisions associated with each network interface. See ``Monitoring TCP/IP performance'' for more information.