# Set Up Speed and Duplex

- Overview

- Microsoft Windows

- Linux

- FreeBSD

- UnixWare and Open UNIX

## Overview

In the default mode, an Intel PRO/1000 network adapter using RJ-45 connections will attempt to auto-negotiate with its link partner to determine the best setting. If no link is established with the link partner using auto-negotiation, you may need to manually configure the adapter and link partner to the identical setting to establish link and pass packets. See the instructions below for specific steps.

When auto-negotiation is disabled, the possible settings available are:

10 Mbps, half duplex | 10 Mbps, full duplex
100 Mbps, half duplex | 100 Mbps, full duplex

| NOTE: Per the IEEE specification, gigabit speed and duplex cannot be forced.

The setting you choose must be matched by the link partner.

### Manually Configuring Duplex and Speed Settings

If your switch supports NWay* standard and both the adapter and switch are set to auto-negotiate, full duplex is automatic and no action is required on your part. Not all switches support auto-negotiation. Check with your network system administrator to verify whether your switch supports this feature.

Configuration is specific to the driver you’re loading for your operating system. To set a specific Link Speed and Duplex mode, refer to the section below that corresponds to your operating system.

| NOTE: Gigabit speed cannot be forced. It can only be auto-negotiated.
| CAUTION: The settings at the switch must always match the adapter settings. Adapter performance may suffer or your adapter may not operate if you configure the adapter differently from your switch.

## Microsoft Windows* (98SE, Me, NT 4.0, 2000, XP)

The default setting is for auto-negotiation to be enabled. Change this only to match your link partner.

| NOTE: The adapter will not operate at gigabit speed (1000 Mbps) if you disable auto-negotiation.

If Auto Negotiation is disabled, this lets you specify Forced Speed (to 10 or 100 Mbps, but not 1000 Mbps) and Duplex. In this situation, the Negotiable Speeds and Duplexes checkboxes are disabled, since these are set to advertise speeds during auto-negotiation.

If Auto Negotiation is enabled, this enables the Negotiable Speeds and Duplexes checkboxes allowing specific speed advertisement and disabling the Forced Speed and Duplex selection buttons.

If you need to manually change the settings:

> 1. Double-click the Intel® PROSet II icon from the Control Panel or System Tray.

> 2. Click the Link Config tab and highlight the desired adapter in the left window (see example below).

> 3. Click the Disabled button and then set the speed and duplex parameters that match your switch.

> 4. Click OK to finish.

> 5. Restart your computer if prompted.

## Linux*

See e1000.htm on the Intel CD.

## FreeBSD*

See freebsd.htm on the Intel CD.

## UnixWare* 7.x and Open UNIX* 8 Servers

The default setting is auto-negotiation enabled. Change this only to match your link partner.

Run the NETCFG configuration program to manually select the speed and duplex settings needed to match your link partner.

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