# Define destination cache settings for NetLinks in Outbound Multi-Link elements

Information about the performance of each NetLink is cached so that no new measurement is made if a new connection is opened to the same destination within a short time period. You can optionally define the duration of the cached information.

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For more details about the product and how to configure features, click Help or press F1.

## Steps

1. In the Outbound Multi-Link Properties dialog box, select the Advanced tab.
2. Deselect Default.
3. Enter the Timeout (in seconds) after which a new measurement of NetLink performance is made.
   The default is 3600 seconds.
4. Enter the number of Maximum Retries for checking each NetLink.
   The default is 2.
5. Click OK.

## Outbound Multi-Link Properties dialog box

Use this dialog box to define outbound multi-link properties.

Option | Definition
--- | ---
Name | Specifies the Outbound Multi-Link name.
Category | Categories allow you to flexibly filter your Management Client view.
Select | Opens the Category Selection dialog box.
Comment | An optional comment for your own reference.
Method | Defines the method for link selection. Round Trip Time — The firewall periodically probes the NetLinks to test them for speed and selects the fastest available active NetLink for each new outbound connection. Ratio — Traffic is distributed between all the available active NetLinks according to the relative bandwidth of each NetLink. The NetLink with the highest bandwidth is assigned the largest portion of the traffic.

Option | Definition
--- | ---
Multi-Link Members section
NetLink | Shows the selected Netlink.
Type | Shows whether the Netlink is active or standby. Active — Traffic is routed through the NetLink according to the Method you specify in the Outbound Multi-Link element properties. Standby — Traffic is only routed through the NetLink if all primary (active) NetLinks are unavailable.
Selected Range | Specifies the IP address range for dynamic source address translation (NAT) for the internal source IP addresses on this NetLink.
QoS Classes | Specifies the QoS Classes for traffic handled by the NetLink.
Add | Opens the Multi-Link Member dialog box.
Edit | Opens the Multi-Link Member dialog box for the selected Multi-Link Member.
Remove | Removes the selected Multi-Link Members.

Option | Definition
--- | ---
QoS related settings section
Name | Shows the QoS Class and the Netlink name.
NetLink Role | Shows whether the NetLink is Active or Standy.
Method | The method for link selection. Round Trip Time — The firewall periodically probes the NetLinks to test them for speed and selects the fastest available active NetLink for each new outbound connection. Ratio — Traffic is distributed between all the available active NetLinks according to the relative bandwidth of each NetLink. The NetLink with the highest bandwidth is assigned the largest portion of the traffic. No Load Balancing — Traffic is not balanced between the NetLinks based on the QoS Class.