HP 3000 Manuals

NS3000/iX NMMGR Screens Reference Manual

Loopback Network Interface Configuration 

The Loopback Network Interface Configuration screen (#97) in figure 11-3
is displayed when you select an NI name and the NI type LOOP at the
Network Interface Configuration screen (figure 11-2) 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 the
NIname is a configured loopback NI.


          Figure 11-3.  Loopback Network Interface Configuration 

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      (HP modifiable) This is the size of the
(bytes)                   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        This field specifies the number of outbound
buffers                   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

MPE/iX 5.0 Documentation