# About NP Net TCP/IP

This section explains NP Net TCP/IP concepts and describes how to configure NP Net TCP/IP.

NP Net TCP/IP connects these servers together using TCP/IP over Ethernet or an appropriate wide-area network. NP Net TCP/IP can use an existing private network, or it can send messages over a public network. The high bandwidth of Ethernet connections allows for a large volume of network traffic.

NP Net TCP/IP requires an Ethernet card and the NPUM Voicemail Networking software blade. If you have not already done so, install the hardware and software. The rest of the information in this section assumes that you have completed those prerequisite steps.

## NP Net TCP/IP Configuration

NP Net TCP/IP uses certain information that is configured in the TCP/IP Interface optional feature. You must be familiar with this information and you must have configured the TCP/IP interface before starting to configure NP Net TCP/IP. This information is:

- Module Number and Slot Number where the Ethernet card is installed

- The Operation Mode of the card, either primary or secondary

- Whether the card is enabled or disable the Ethernet Card

- Ethernet Card Configuration (either Ethernet 1 or Ethernet 3)

- Domain Name

- Node Name

- Node IP Address

- Subnet Mask

- Physical Network Number

- Broadcast Address

- Gateway IP Address

When you configure NP Net TCP/IP, as described in the Procedures section of this section, you define the following parameters:

- The module number that contains the Ethernet card to use for NP Net TCP/IP, and the number of the Ethernet card in that module. You can only configure NP Net TCP/IP on one module of a multi-module server.

- The System Node Name, which is used by NP Net in reports.

- The System Local Node Number, which is used by NP Net to do message routing (see Configuring the Network Node Table for information on configuring the Network Node Table).

- System Network Message Limit in number of minutes

- The number of Send and Receive Circuits (virtual circuits) to be used by NP Net. The number of circuits determines the throughput. You can configure a node with more of one type of circuit than the other, if needed.