Create NetLink elements for Multi-Link configuration

NetLink elements usually represent Internet connections, but you can also use NetLinks to represent other network connections. You can use NetLinks to define alternative routes that lead to the same destination IP addresses.

Although some NetLink element settings are optional, we recommend that you configure all settings for a fully functional configuration.

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

Steps

Select Configuration, then browse to SD-WAN.
Browse to Traffic Handlers.
Right-click Traffic Handlers, then select New > Static NetLink or New > Dynamic NetLink.
Configure the settings, then click OK.

Static NetLink Properties dialog box

Use this dialog box to define Static NetLink elements.

Option	Definition
General tab
Name	The name of the element.
Gateway	Specifies the next-hop Gateway the NetLink uses. The Gateway is usually added as a Router element, but you can also choose another Firewall according to your network configuration.
Network	Specifies the address space that the ISP has assigned to your organization. Click Select to select an element. Do not select the Any Network element for the NetLink. Select or create Network elements that represent the specific public IP addresses assigned by your ISP and routed to the Internet provider’s router.
DNS IP Addresses (Optional)	Specifies the IP addresses of the DNS servers that resolve DNS requests sent from the interface with which the NetLink is associated. These NetLink-specific DNS servers provide DNS services only when using valid IP addresses in the address space that the ISP has assigned to your organization. Note: To use NetLink-specific DNS IP addresses, you must configure DNS Relay for the firewall. Note: DNS IP addresses configured in the Engine Editor can override this setting. Click Add to add an element to the table, or Remove to remove the selected element. IP Address — Adds an IP Address element that represents a single IP address. Network Element — Adds a Network element that represents a network space.
Provider Name	Specifies the name of the internet service provider.
Download Speed or Upload Speed (Required for ratio-based load-balancing)	Enter the actual bandwidth that this connection provides. For example, if the stated speed of the connection is 50 Mbit/s, but the connection provide a maximum speed of 30 Mbit/s, enter 30 Mbit/s. These values are used in ratio-based load-balancing to calculate how much traffic each link receives in relation to the other links. They are also used to calculate the current traffic load as a percentage of the total capacity of the connection in the SD-WAN dashboard in the Home view.
Category (Optional)	Includes the element in predefined categories. Click Select to select a category.
Comment (Optional)	A comment for your own reference.

Option	Definition
Probing tab
Probe IP Addresses	Shows the IP addresses that are probed with ICMP echo requests (ping) to determine if the link is up. We recommend entering more than one address to avoid excluding the link in case the host that is probed goes down. Select addresses that give reliable results of end-to-end connectivity to destinations that need to be reached through the NetLink, such as a remote server reached through the Internet. Click Add to add a row to the table, or Remove to remove the selected row.
Active Mode	Specifies the probe period and timeout in seconds when Active Mode is used. Period — Specifies the probe period in seconds. Timeout — Specifies the probe timeout in seconds.
Standby Mode	Specifies the probe period and timeout in seconds when Standby Mode is used. Timeout — Specifies the probe timeout in seconds. Period — Specifies the probe period in seconds.

Dynamic NetLink Properties dialog box

Use this dialog box to define dynamic NetLink elements.

Option	Definition
General tab
Name	The name of the element.
Provider Name	Specifies the name of the internet service provider.
Learn DNS IP Addresses Automatically	When selected, the NetLink automatically learns the IP addresses of the internet service provider's DNS servers.
Download Speed or Upload Speed (Required for ratio-based load-balancing)	Enter the actual bandwidth that this connection provides. For example, if the stated speed of the connection is 50 Mbit/s, but the connection provide a maximum speed of 30 Mbit/s, enter 30 Mbit/s. These values are used in ratio-based load-balancing to calculate how much traffic each link receives in relation to the other links. They are also used to calculate the current traffic load as a percentage of the total capacity of the connection in the SD-WAN dashboard in the Home view.
Category (Optional)	Includes the element in predefined categories. Click Select to select a category.
Comment (Optional)	A comment for your own reference.

Option	Definition
Probing tab
Probe IP Addresses (Optional)	Shows the IP addresses that are probed with ICMP echo requests (ping) to determine if the link is up. We recommend entering more than one address to avoid excluding the link in case the host that is probed goes down. Select addresses that give reliable results of end-to-end connectivity to destinations that need to be reached through the NetLink, such as a remote server reached through the Internet. Click Add to add a row to the table, or Remove to remove the selected row.
Active Mode (Optional)	Specifies the probe period and timeout in seconds when Active Mode is used. Period — Specifies the probe period in seconds. Timeout — Specifies the probe timeout in seconds.
Standby Mode (Optional)	Specifies the probe period and timeout in seconds when Standby Mode is used. Timeout — Specifies the probe timeout in seconds. Period — Specifies the probe period in seconds.