It provides for load sharing between NLB cluster
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Configuring Network Load Balancing and CARP Support
FIGURE 6.23 Selecting the intra-array communication IP address.
Understanding Bi-Directional Affinity with Network Load Balancing (NLB)
One of the main challenges faced by the ISA team in regards to Network Load Balancing
was enabling and supporting bi-directional affinity with NLB. Bi-directional affinity is
basically needed to ensure that traffic sent from one network to another, and sent back to
the client from that remote network, is properly sent and received through the same ISA
server the entire time. If bi-directional affinity is not enabled, then traffic sent through
one ISA server might be routed through the NLB cluster to the wrong server, which causes
sporadic serious issues.
Enabling NLB for ISA Networks
To enable NLB on an ISA member server, perform the following procedure on each server:
1. From the ISA Server Admin Console, navigate through the console tree to Arrays,
Edge-Array, Configuration, Networks node.
2. In the Tasks tab of the Tasks pane, click the link for Enable Network Load Balancing
Integration.
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