HP StorageWorks Enterprise File Services WAN Accelerator - Manual (Page 49)

HP S TORAGE W ORKS EFS WAN A CCELERATOR M ANAGEMENT C ONSOLE U SER G UIDE 49
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6. Select Auto, Full or Half in the Duplex drop-down list to set the duplex speed for
the primary interface. The default value is Auto.
7. Type a Maximum Transmission Unit (MTU) value in the MTU text box. The MTU
is the largest physical packet size, measured in Bytes, that a network can transmit.
The default value is 1500.
8. Under Bandwidth Limit, click Limit Optimized Bandwidth Utilization to and
type a value in the kbps text box to restrict the total optimized traffic to a specific
bandwidth limit. The default value is 1500.
IMPORTANT: The bandwidth limit applies only to the outgoing WAN interface and outgoing
packets, it does not apply to passed through traffic. To limit a particular link to a certain
bandwidth, you must set the limit on the client and the server HP EFS WAN Accelerator.
9. Click Apply to apply your settings to the running configuration. (Apply your
settings to test a new configuration before committing it to memory.)
10. Click Save to write your settings to memory or click Reset to return the settings to
their previous value.
Setting In-Path
Interfaces
During the initial configuration of the HP EFS WAN Accelerator you assigned an in-
path interface to the HP EFS WAN Accelerator, check or modify your settings in the
Setup: Host Settings - In-Path (LAN/WAN) Interface page. This IP address is the in-
path main interface.
You specify the in-path interface if you plan to have the HP EFS WAN Accelerator 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).
IMPORTANT: If there is a routed network on the LAN-side of the in-path HP EFS WAN
Accelerator, the router that is the default gateway for the HP EFS WAN Accelerator must not
have the Access Control List (ACL) configured to drop packets from the remote hosts as its
source. The in-path HP EFS WAN Accelerator uses IP masquerading to appear as the remote
server.
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-duplex and 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: