LAN 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 LAN 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 LAN.

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

Load network directory mapping? (Y/N)

If you have non-HP nodes on the LAN (nodes that do not support either ARP or probe protocols,) you must enter these nodes into the network directory and set load network directory mapping to Y.

HP recommends the default unless non-HP nodes are on the LAN and the network directory has been configured. Refer to Chapter 13 "Network Directory" for information about the network directory.

Default value: N

Range: Y or N

Enable Ethernet? (Y/N)

This flag enables the Ethernet protocol to run either by itself or with the IEEE802.3 protocol. You can enable one or the other or both of these protocols simultaneously. One or the other must be enabled (you cannot disable both). Ethernet is enabled by default. Disabling Ethernet has the effect of disabling the ARP protocol as well.

Default value: Y

Range: Y or N

Enable IEEE802.3? (Y/N)

This flag enables the IEEE 802.3 protocol to run either by itself or with the Ethernet protocol. You can enable one or the other or both of these protocols simultaneously. One or the other must be enabled (you cannot disable both). IEEE 802.3 is enabled by default. Disabling IEEE 802.3 has the effect of disabling the probe protocol as well.

Default value: Y

Range: Y or N