Alteon Application Switch Operating System Application Guide
WAN Link Load Balancing
636 Document ID: RDWR-ALOS-V2900_AG1302
The inbound traffic resolution in Figure 102 - External Client Accessing Data from a Non-SLB Group,
page 635 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.
Note: Radware recommends default gateways for each ISP VLAN to avoid asymmetric routing.
4. The client again requests with the provided virtual IP address.
5. The server responds to the content request.
An allow filter at port 5 processes the data for the services configured on the server. For
example, if the client sends an HTTP request to server 3, then the allow filter should be
configured for source port 80. Similarly, if the client sends an SMTP request to server 3, then the
allow filter should be configured for source port 25.
6. The transparent load balancing feature on the WAN ports maintains persistency, so that the
traffic returns via the same ISP.
External Client Accessing Data from an SLB Group
In Figure 103 - External Client Accessing Data from an SLB Group, page 636, the client request is
for www.radware.com. The client request should be load balanced between SLB servers 5 and 6.
Figure 103: External Client Accessing Data from an SLB Group
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