Network interface Level
A network interface is the network-specific software that communicates with the network-specific device driver and the IP layer in order to provide the IP layer with a consistent interface to all network adapters that might be present.
The IP layer selects the appropriate network interface based on the destination address of the packet to be transmitted. Each network interface has a network address. The Network Interface layer is responsible for adding or removing any link layer protocol header required to deliver a message to its destination. The network adapter device driver controls the network adapter card.
Although not required, a network interface is usually associated with a network adapter. For instance, the loopback interface has no network adapter associated with it. A machine must have one network adapter card for each network (not network type) to which it connects. However, a machine requires only one copy of the network interface software for each network adapter it uses. For instance, if a host attaches to two token-ring networks, it must have two network adapter cards. However, only one copy of the token-ring network interface software and one copy of the token-ring device driver is required.
TCP/IP problems with an Ethernet network interface refer to this checklist if TCP/IP problems persist with an Ethernet network interface. If the network interface has been initialized, the addresses correctly specified, and you have verified that the adapter card is good:
- Verify that you are using a T-connector plugged directly into the inboard/outboard transceiver.
- Make sure you are using an Ethernet cable (Ethernet cable is 50 OHM).
- Make sure you are using Ethernet terminators (Ethernet terminators are 50 OHM).
Ethernet adapters can be used with either the transceiver that is on the card or with an external transceiver. There is a jumper on the adapter to specify which you are using. Verify that your jumper is set correctly (see your adapter manual for instructions).
Verify that you are using the correct Ethernet connector type (thin is BNC; thick is DIX). If you change this connector type, use the Web-based System Manager, wsm, or the smit chgenet SMIT fast path to set the Apply Change to Database Only field. (Check the field in Web-based System Manager or set to Yes in SMIT.) Restart the machine to apply the configuration change. (See Adapter management and configuration.)
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