User guide

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Chapter 7 - Using the MultiVOIP Software
Multi-Tech Systems, Inc. MultiVOIP User Guide
IP Statistics
IP is a connection-less network protocol residing in the network layer of a conventional OSI
layered model (for more information on this model, refer to Appendix A). Depending on what is
going on at the application layer, IP will typically use one of two transport layer protocols: User
Datagram Protocol (UDP), a connection-less transport layer protocol used with TFTP or SNMP;
and Transport Control Protocol (TCP) is a connection-oriented transport layer protocol used
with FTP, Telnet, and SNMP.
UDP makes use of the port concept and has no measures for flow control, reliability, or error
recovery. It is used when the full services of TCP are not required, and the reliability measures
must be assumed by another layer.
TCP works well in environments where the reliability measures are not assumed by other
layers. It is connection-oriented and has a full range of services.
For the most part these statistics are informational, and their use as a troubleshooting tool will
be contingent on the applications running in the upper layers. For example, if you are having
problems connecting to the MultiVOIP’s Web server, you would look under the TCP section to
see if any packets are being transferred. If not, that may indicate the Web server is not
enabled. Or, if you are having problems establishing a remote connection through TFTP, you
could look in the UDP section to see if any packets are being received. If not, you may need to
review your network addressing.