NS3000/iX NMMGR Screens Reference Manual - Edition 8 (36922-90038)

Chapter 11 233
100Base-T Network Interface Configuration Screens
100Base-T Network Interface Configuration
Fields Network segment
size (bytes) (HP modifiable.) This field specifies the largest
packet (including all data, protocol headers, and link
level headers) that will be sent by the 100Base-T
device. The only reason for entering a value smaller
than 1514 is to make better use of memory for those
systems where it is known that upper layer services
will always send shorter messages. Note that whenever
packets larger than the network segment size are sent,
they will be fragmented to the network segment size,
thus incurring fragmentation overhead at the source
and assembly overhead at the destination node.
Default value: 1514 bytes
Range: 300–1514
HP UPC
number (HP modifiable.) The HP universal product code,
which is used to establish an HP-unique address used
by the probe protocol.
Default value: 08-00-09
Change the default only in rare circumstances. If all
nodes on the LAN are not configured with identical
HP UPC numbers, probe multicasts will not be
universally recognized by nodes on the network.
Number of
outbound buffers
This field specifies the number of buffers to be allocated
for outbound data. Outbound buffers are used for
outbound data packets and are held by the transport
until they are acknowledged by the destination node.
Underallocation may adversely affect TCP throughput.
Overallocation may waste core memory.
Related screen:
• NETXPORT.GPROT.TCP
The maximum number of connections is configured
here. If it is increased, consider increasing the
number of outbound buffers also.
Default value: 128
Range: 128–4096