HP Enterprise File Services WAN Accelerator manual Speed and Duplex Tips, 1500

Control	Description
Additional Interface Settings	Speed. Select the speed from the drop-down list. The default value is Auto.
	If your network routers or switches do not automatically negotiate the speed and duplex,
	you must manually set the speed and duplex for the primary interface.
	The speed and duplex must match (LAN and WAN) in an in-path configuration. If they
	do not match you might have a large number of errors on the interface when it is in
	bypass mode, because the switch and router are not set with the same speed settings.
	Duplex. Select Auto, Full or Half from the drop-down list. The default value is Auto.
	If your network routers or switches do not automatically negotiate the speed and duplex,
	you must manually set the speed and duplex for the primary interface.
	The speed and duplex must match (LAN and WAN) in an in-path configuration. If they
	do not match you might have a large number of errors on the interface when it is in
	bypass mode, because the switch and router are not set with the same duplex settings.
	MTU. Specify the Maximum Transmission Unit (MTU) value. The MTU is the largest
	physical packet size, measured in Bytes, that a network can transmit. The default value is
	1500.

Setting In-Path Interfaces

4.Click Apply to apply your settings to the running configuration. (Apply your settings to test a new configuration before saving them permanently.)

5.Click Save to save your settings permanently or click Reset to return the settings to their previous value.

You modify the settings for the in-path interface in the Host Settings - Interface: In- Path (LAN/WAN) page.

You specify the in-path interface if you plan to have the appliance in the direct path (the same subnet) as the client and the server in your network. You also set the in-path gateway (WAN router).

NOTE: You were prompted to configure the in-path interface when you completed the installation wizard. This section describes how you can modify these settings.

Speed and Duplex Tips

If your network routers do not automatically negotiate the speed and duplex, you must manually set the speed and duplex for the in-path interface (that is, the HP EFS WAN Accelerator).

Speed and duplex mismatches can easily occur in a network. For example, if one end of the link is set at half or full-duplexand the other end of the link is configured to auto negotiate (auto), the link defaults to half-duplex, regardless of the duplex setting on the non-auto-negotiated end. This duplex mismatch passes traffic, but it causes interface errors and results in degraded optimization.

The following are general guidelines to avoid speed and duplex mismatches when configuring the HP EFS WAN Accelerator:

54 CONFIGURING THE HP EFS WAN ACCELERATOR