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Configure Gateway Load Balancing and Failover App li cabl e to Versi on: 10.00 onw ards Overview Today organizations require stable, redundant and fast ISP links to run business critical applications. To achieve constant and secure availability to the Internet and to avoid network vulnerability, organizations prefer to have multiple ISP links. Multiple ISP links provisions network administrator to configure failover and load balancing over Internet links. Cyberoam supports Load Balancing and Failover for multiple ISP links based on number of WAN ports available in the Appliance. You can terminate multiple ISP links on available physical interfaces of Cyberoam in the form of Gateways. A Gateway can be configured as an Active or a Backup Gateway. The Gateways can be setup in Two (2) ways: Act ive-A cti ve �Here, all Gateways are in Active State and traffic is Load Balanced between all Active Gateways. By default, Cyberoam adds a new gateway as an Active Gateway. Hence, Load Balancing is automatically enabled between the existing and newly added links. Cyberoam employs weighted round robin algorithm for load balancing to enable maximum utilization of capacities across the various links. Act ive-B acku p �Here, One (1) or more Gateways are configured as Backup. This setup allows Administrator to configure Gateway Failover if any active gateway goes down. Note�
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Scenario Consider the hypothetical network in which one ISP link is terminated on Port B and Administrator wants to terminate another ISP link on Port D.
IP Schema Below given IP schema is configured on Cyberoam.
Parameters
Value
Port A IP Address 10.10.1.1 Subnet Mask 255.255.255.0 Zone LAN Port B IP Address 172.16.16.1 Subnet Mask 255.252.240.0 Zone WAN Gateway Details ISP Name Default IP Address 172.16.16.15 Port C IP Address 10.10.10.1 Subnet Mask 255.255.255.0 Zone DMZ Port D Port D is an unbound port so zone type for port D is set to ‘N/A’ DNS Configuration Primary DNS 4.2.2.2 This article is divided into the following Three (3) sections:
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- Add a New Gateway - Configure Load Balancing - Configure Gateway Failover
Prerequisites An unbound physical port should be ava ilable on Cyberoam. An unbound port is one, which is no t assigned to any security zone.
Add a New Gatew ay You must be logged on to the Web Admin Console as an administrator with Read-Write permission for relevant feature(s). To add a gateway, go to Network > Interface > Interface and configure an unbound physical port according to parameters given below. Here, as an example, we have configured Port D.
Parameters
Value
Description
General Settings Physical Interface
PortD
Physical Interface for example, Port A, Port B
Network Zone
WAN
Select Zone to which Interface belongs.
IP Assignment
Static
Select IP Assignment type. Available Options: Static : Static IP Addresses are available for all the zones. PPPoE: PPPoE is available only for WAN Zone. If PPPoE is configured, WAN port is displayed as the PPPoE Interface. DHCP: � � ��������������������� �� �����
IP Address
10.10.2.1
Specify IP Address.
Subnet Mask
/24 (255.255.255.0)
Specify Network Subnet mask.
Primary DNS
203.88.135.194
Specify Primary DNS Server IP Address.
Secondary DNS
4.2.2.2
Specify Secondary DNS Server IP Address.
Gateway Name
PortD_Gateway
Specify Gateway Name
IP Address
10.10.2.19
Specify IP Address of Gateway
Gateway Details
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Click OK to update the interface. On updating the interface, the gateway is added to the list of Gateways in Network > Gateway > Gateway .
Configure Load Balancing Cyberoam allows Load Balancing between 2 or more Active-Active Gateways. By default, Cyberoam adds a new gateway as an Active Gateway. Hence, Load Balancing is automatically enabled between the existing and newly added links. Weighted Round Robin algorithm is used for load balancing wherein each link is assigned a weight. The traffic that Cyberoam distributes among the links is in proportion to the weight assigned to them. To assign weight to a Link, go to Network > Gateway > Gateway and select the required Gateway.
Mention the Weight, as shown below and click OK.
Configure Gateway Failover Cyberoam allows Gateway Failover both in Active-Active and Active Backup setup. In an Act ive- Act ive setup, if any one of the active gateways fails, the traffic is redirected to another active gateway. Administrator can specify Failover Conditions to indicate how the failed gateway is to be detected.
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In Act ive-B acku p setup, one or more of the gateways are configured as backup gateway. If an Active Gateway fails, the traffic can be redirected to a backup gateway, ensuring Internet continuity. Configure Backup Gateway You can configure a gateway as a Backup gateway by following steps below. 1.
Go to Network > Gateway > Gateway and select the required Gateway.
2.
Select Gateway Type as Backup and configure Backup Gateway Details as shown below.
Click OK to save changes.
This setup indicates if any Active Gateway Fails, PortD_Gateway would get activated and would inherit the weight of the failed gateway. Configure Failover Condition By default, on adding a gateway, Cyberoam adds a Failover Rule indicating that if Cyberoam is not able to PING the gateway, it would be considered down, as shown below.
Click Add to add another rule, or Edit to change the existing rule. Here, as an example, we have added a Rule that indicates that if Cyberoam is not able to PING the Gateway 172.16.16.15 and establish a TCP connection on port 80 with 4.2.2.2, the gateway will be considered down.
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Click OK to save the Gateway Failure Rule. During a link failure, Cyberoam regularly checks the health of a given connection, assuring fast reconnection when Internet service is restored. When the connection is restored and gateway is up again, traffic is rerouted through the Active gateway automatically.
Document Version: 2.1 – 19 May, 2013
