How To Configure Virtual Host with Load Balancing and Health Checking

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1 How To Configure Virtual Host with Load How To Configure Virtual Host with Load Balancing and Health Checking Balancing and Health Checking Applicable Version: Build 473 onwards Overview This article describes how you can configure a Virtual Host in Cyberoam with Load Balancing and Health Checking. Load Balancing enables distribution of incoming traffic over multiple internal servers. Health Checking keeps a check on servers and sends a notification to the administrator whenever a server goes down or comes up. Virtual host Virtual host implementation is based on the Destination NAT concept. Virtual Host maps services of a public IP Address to services of a host in a private network. In other words, it is a mapping of public IP address to an internal IP address. This virtual host is used as the Destination address to access internal or DMZ server. A Virtual host can be a single IP address, an IP address range or a Cyberoam interface itself. Cyberoam automatically responds to the ARP request received on the WAN zone for the external IP address of Virtual host. Load Balancing Methods When a Virtual host is mapped with multiple servers, the Administrator can load balance traffic passing through the Cyberoam to multiple servers. Cyberoam virtual host load balancing supports various load balancing methods and real server health monitoring. The load balancing method defines how sessions are load balanced to multiple servers. Cyberoam supports the following load balancing methods: Round Robin: In this method, requests are served in a sequential manner where the first request is forwarded to the first server, second request to the second server and so on. When a request is received, Cyberoam checks to see which was the last server that was assigned a request. It then assigns this new request to the next available server. When to use: This method can be used when equal distribution of traffic is required and there is no need for session-persistance. First Alive: In this method, all incoming requests are served by the first server (the first IP Address that is configured in the IP Range). This server is considered as the primary server and all others are considered as backup. Only when the first server fails, the requests are forwarded to the next server in line. When to use: This method is used for failover scenarios. Random: In this method, the requests are forwarded to the servers randomly. Although, Cyberoam makes sure that all configured servers receive equally distributed load. Hence, this method is also called uniform random distribution. When to use: This method can be used when equal distribution of traffic is required and there is no need for session-persistance or order of distribution.

2 Sticky IP: In this method, along with Round Robin distribution of traffic, Cyberoam forwards incoming traffic according to the Source IP Address. All traffic from a particular source is forwarded only to its mapped Server. This means that all requests for a given source IP are sent to the same application server instance. When to use: This method is useful in cases where all requests or sessions are required to be processed by the same server. For example, Banking websites, E-Commerce websites. Health Check The Health Check feature monitors servers and sends a notification to the administrator when the status of any of the servers changes. This ensures that the requests are forwarded only to servers that are up and running. For Health Check, Cyberoam uses two methods: TCP Probe and ICMP Probe. Scenario Consider a hypothetical network, as shown in the diagram below, with Web Servers 1, 2 and 3 hosted in DMZ and are accessed from the Internet using a single Public IP address , i.e., Cyberoam WAN IP. In this article, we create a virtual host for the Web Servers to implement Load Balancing and Health Checking.

3 Configuration The entire configuration is to be done from Web Admin Console using profile having read-write administrative rights over relevant features. Step 1: Configure Virtual Host Go to Firewall > Virtual Host > Virtual Host and click Add to create a virtual host with parameters given below. Parameter Description Parameter Value Description Name WebServers Name to identify the Virtual Host. External IP PortB Mapped IP Physical Zone Port Forwarding DMZ Enable Port Forwarding Enabled Protocol External Port Type TCP Port External Port 80 Mapped Port Type Port The IP address through which Internet users access the internal server/host. The IP Range of the internal servers/hosts. Please note that Load Balancing and Health Check can only be configured on an IP Range. LAN, WAN, DMZ, VPN or custom zone of the mapped IP address(s). For example, if mapped IP address represents any internal server then it is the zone in which server resides physically. Click to enable service port forwarding. If Port Forwarding is enabled, following options are available. Select the protocol TCP or UDP that you want the forwarded packets to use. Click to specify whether port mapping should be single or range of ports. Specify public port number for which you want to configure port forwarding. Click to specify whether port mapping should be single or range of ports.

4 Mapped Port 80 Enable Load Balancing Enabled Method Round Robin Specify mapped port number on the destination network to which the public port number is mapped. Click to enable load balancing. This option is available if incoming traffic is to be distributed to more than one internal server Select the method for load balancing from the available options. Available Options: Round Robin First Alive Random Sticky IP Enable Health Check (For Failover) Health Check Method Interval 60 Timeout 2 Retries 3 Enabled ICMP Probe For details on each method, refer to the Load Balancing Methods section. Click to enable checking for failover. By default, this feature is enabled for First Alive Load Balancing method. For other methods, it is optional. Select the method to check the health of the server from the available options: TCP Probe and ICMP Probe. Specify the time interval in seconds after which the health will be monitored. Specify the time interval in seconds within which the server must respond. Specify the number of tries to probe the health of the server, after which the server will be declared unreachable

5 Step 2: Create Firewall Rule(s) to Allow Access to Web Servers from Other Zones On clicking OK, the Add Firewall Rules For Virtual Host screen appears which enables you to create rules to allow access to the Web Servers from other zones. Enable Add Firewall Rule(s) For Virtual Host. Set rule parameters as desired. Here, we have created a rule which allows access to the Web Servers from WAN zone. Select Yes for Create Reflexive Rule.

6 The above configuration allows access to Web Servers from Internet and implements Load Balancing and Health Checking. Step 3: Verify Firewall Rules You can verify the Firewall Rules from Firewall > Rule > Rule, as shown below. Document Version: March, 2014

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