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Loopback Network Interface Configuration

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The Loopback Network Interface Configuration screen (#97) in Figure 11-3 "Loopback Network Interface Configuration Screen" is displayed when you select an NI name and the NI type LOOP at the Network Interface Configuration screen (Figure 11-2 "Network Interface Configuration") and press the [Add] or [Modify] function key. It is also displayed when you type the path name:

@NETXPORT.NI.NIname

in the command window of any screen and press the [Enter] key, where NIname is a configured loopback NI.

Figure 11-3 Loopback Network Interface Configuration Screen

[Loopback Network Interface Configuration Screen]

Whenever a transport user makes a connection to a user process on the same node, all outbound packets on this connection are turned around at the NI level and passed back up through the protocol stack to the destination user. This screen supplies information necessary for this operation, performed by the loopback NI.

Press the [Save Data] function key to transfer the data displayed on the screen to the configuration file you are creating or updating. Verify that the data record has been created by checking that the Data flag is set to Y.

Fields

Network segment size (bytes)

(HP modifiable.) This is the size of the physical buffer for the loopback network interface. No fragmenting or fragment assembly is performed on the loopback NI. There is no limitation that only single physical buffers (not chained buffers, for example) can be passed across the I/O interface to the board, because outbound data is turned around at the NI layer. Therefore, if user data exceeds the physical buffer size, it is put into logical buffers (chained physical buffers) that are the size of the user data.

Default value: 1024

Range: 1024-4032

Number of outbound buffers

This field specifies the number of outbound buffers to be allocated for loopback. The default is based on the assumption that the network manager desires to allow no more than the default number of TCP connections (128) to use the loopback NI. Therefore, the default is 128. If you change the number of TCP connections from the default value, you should reconsider the number of inbound buffers for all NIs.

Default value: 128

Range: 128-1024



Network Interface Configuration

Chapter 12 Logging Configuration Screens