Alteon Application Switch Operating System Application Guide
Virtual Private Network Load Balancing
Document ID: RDWR-ALOS-V2900_AG1302 693
session lookup so that it can be load balanced to the same server. If the ISAKMP session is not
found, the IPSec session is bound to a VPN server according to the previously configured load-
balancing metrics.
VPN Load Balancing Configuration
Before you start configuring Alteon for VPN load balancing, do the following:
• Configure Alteon with firewall load balancing (FWLB).
• Configure a filter to enable the transparent load balancing (Return to Source MAC address)
option. This adds an opposite entry in the session table so that the return traffic matches its
source MAC address.
Figure 117 - Example VPN Load-Balancing Configuration, page 693
illustrates VPN load balancing
with two VPN devices and four Alteons in a four-subnet scenario:
Figure 117: Example VPN Load-Balancing Configuration
>> # /cfg/slb/filt 20/adv
(Select the Advanced menu for Filter 20)
>> Filter 20 Advanced# rtsrcmac ena
(Enable Return to Source MAC Address)
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