Radware Alteon User Manual

Alteon Application Switch Operating System Application Guide
WAN Link Load Balancing
Document ID: RDWR-ALOS-V2900_AG1302 637
The inbound traffic resolution in Figure 103 - External Client Accessing Data from an SLB Group,
page 636 is described as follows:
1. The client makes a request to www.radware.com.
2. The client query does not exist in the local DNS database. Local DNS queries the Domain Name
Server on Alteon.
3. Alteon monitors WAN links and responds with the virtual IP address of the optimal ISP.
4. The client makes the request again to www.radware.com with the provided virtual IP address.
5. The SLB servers respond to the content request, because real server 7 IP address on Alteon is
the virtual server address of www.radware.com.
6. The session request egresses from port 1 and port 11 of Alteon where it is then load balanced
between the SLB servers. The virtual server IP address for the SLB servers on Alteon are
configured as a real server IP address (Real 7 IP: 30.30.30.2). Real 7 is added to a group.
7. The returning data from the SLB server reaches port 1, which is enabled for server processing.
For information on server processing, see Network Topology Requirements, page 169. The
transparent load balancing feature on the WAN ports maintains persistency, so that the traffic
returns via the same ISP.
Configuring WAN Link Load Balancing
This section describes how to configure Alteon for load balancing the WAN links in different
environments:
• Before You Begin, page 637
• Configuration Summary, page 638
• WAN Link Load Balancing Examples, page 639
Before You Begin
The following is required prior to configuration:
• Log into the CLI as the administrator.
• Connect each WAN link to a separate port on Alteon.
Note: Do not connect two or more WAN links to the same Alteon port using a Layer 2 switch.
WAN link load balancing uses the proxy IP address of the destination port when translating the
source IP address of the requests.
• Do not configure your WAN link ports into trunk groups.

Radware Alteon Specifications

General

Model	Alteon
Manufacturer	Radware
Layer	Layer 4-7
Type	Application Delivery Controller (ADC)
Features	Load balancing, SSL offloading, application acceleration, DDoS protection
Form Factor	Virtual Appliance