Global Setting

 

Enable DNS Load Balancing

Select this to enable DNS load balancing.

Configuration

 

Add

Click this to create a new entry.

Edit

Double-click an entry or select it and click Edit to open a screen where you can modify the entry’s settings.

Remove

To remove an entry, select it and click Remove. The Zyxel Device confirms you want to remove it before doing so.

Activate

To turn on an entry, select it and click Activate.

Inactivate

To turn off an entry, select it and click Inactivate.

Move

To move an entry to a different number in the list, click the Move icon. In the field that appears, specify the number to which you want to move the entry.

Status

This icon is lit when the entry is active and dimmed when the entry is inactive.

Priority

This field displays the order in which the Zyxel Device checks the member interfaces of this DNS load balancing rule.

Query Domain Name

This field displays the domain name for which the Zyxel Device manages load balancing between the specified interfaces.

Query From Address

This field displays the source IP address of the DNS query messages to which the Zyxel Device applies the DNS load balancing rule.

Query From Zone

The Zyxel Device applies the DNS load balancing rule to the query messages received from this zone.

Load Balancing Member

This field displays the member interfaces which the Zyxel Device manages for load balancing.

Algorithm

This field displays the load balancing method the Zyxel Device uses for this DNS load balancing rule.

Weighted Round Robin - Each member interface is assigned a weight. An interface with a larger weight gets more chances to transmit traffic than an interface with a smaller weight. For example, if the weight ratio of wan1 and wan2 interfaces is 2:1, the Zyxel Device chooses wan1 for 2 sessions’ traffic and wan2 for 1 session’s traffic in each round of 3 new sessions.

Least Connection - The Zyxel Device chooses choose a member interface which is handling the least number of sessions.

Least Load - Outbound - The Zyxel Device chooses a member interface which is handling the least amount of outgoing traffic.

Least Load - Inbound - The Zyxel Device chooses a member interface which is handling the least amount of incoming traffic.

Least Load - Total - The Zyxel Device chooses a member interface which is handling the least amount of outgoing and incoming traffic.

Apply

Click this button to save your changes to the Zyxel Device.

Reset

Click this button to return the screen to its last-saved settings.

Create New Object

Use this to configure any new setting objects that you need to use in this screen.

General Settings

 

Enable

Select this to enable this DNS load balancing rule.

DNS Settings

 

Query Domain Name

Type up to 255 characters for a domain name for which you want the Zyxel Device to manage DNS load balancing. You can use a wildcard (*) to let multiple domains match the name. For example, use *.example.com to specify any domain name that ends with “example.com” would match.

Time to Live

Enter the number of seconds the Zyxel Device recommends DNS request hosts to keep the DNS entry in their caches before removing it. Enter 0 to have the Zyxel Device not recommend this so the DNS request hosts will follow their DNS server’s TTL setting.

Query From Setting

 

IP Address

Select the name of an P address object, including geographic address object, of a computer or a DNS server which makes the DNS queries upon which to apply this rule.

DNS servers process client queries using recursion or iteration:

Zone

Select the zone of DNS query messages upon which to apply this rule.

Load Balancing Member

 

Load Balancing Algorithm

Select a load balancing method to use from the drop-down list box.

Select Weighted Round Robin to balance the traffic load between interfaces based on their respective weights. An interface with a larger weight gets more chances to transmit traffic than an interface with a smaller weight. For example, if the weight ratio of wan1 and wan2 interfaces is 2:1, the Zyxel Device chooses wan1 for 2 sessions’ traffic and wan2 for every session’s traffic in each round of 3 new sessions.

Select Least Connection to have the Zyxel Device choose the member interface which is handling the least number of sessions.

Select Least Load - Outbound to have the Zyxel Device choose the member interface which is handling the least amount of outgoing traffic.

Select Least Load - Inbound to have the Zyxel Device choose the member interface which is handling the least amount of incoming traffic.

Select Least Load - Total to have the Zyxel Device choose the member interface which is handling the least amount of outgoing and incoming traffic.

Failover IP Address

Enter an alternate IP address with which the Zyxel Device will respond to a DNS query message when the load balancing algorithm cannot find any available interface.

Add

Click this to create a new member interface for this rule.

Edit

Double-click an entry or select it and click Edit to open a screen where you can modify the entry’s settings.

Remove

To remove an entry, select it and click Remove. The Zyxel Device confirms you want to remove it before doing so.

#

This field displays the order in which the Zyxel Device checks this rule’s member interfaces.

IP Address

This field displays the IP address of the member interface.

Monitor Interface

This field displays the name of the member interface. The Zyxel Device manages load balancing between the member interfaces.

Weight

This field is available if you selected Weighted Round Robin as the load balancing algorithm. This field displays the weight of the member interface. An interface with a larger weight gets more chances to transmit traffic than an interface with a smaller weight.

OK

Click OK to save your changes back to the Zyxel Device.

Cancel

Click Cancel to exit this screen without saving.

Member

The Zyxel Device checks each member interface’s loading in the order displayed here.

Monitor Interface

Select an interface to associate it with the DNS load balancing rule. This field also displays whether the IP address is a static IP address (Static), dynamically assigned (Dynamic) or obtained from a DHCP server (DHCP Client), as well as the IP address and subnet mask.

Weight

This field is available if you selected Weighted Round Robin for the load balancing algorithm.

Specify the weight of the member interface. An interface with a larger weight gets more chances to transmit traffic than an interface with a smaller weight.

IP Address

 

Same as Monitor Interface

Select this to send the IP address displayed in the Monitor Interface field to the DNS query senders.

Custom

Select this and enter another IP address to send to the DNS query senders.

OK

Click OK to save your changes back to the Zyxel Device.

Cancel

Click Cancel to exit this screen without saving.