Load Balancing Metrics For Non-Transparent Routing Fwlb; Health Check; Persistency - Avaya P333R-LB User Manual

Chapter 7 Firewall Load Balancing

Load Balancing Metrics for Non-Transparent Routing FWLB

Non-Transparent Routing FWLB uses the following metrics:
• Hash.
• MinMiss Hash.
Hash is the default metric for FWLB, and the metric parameter is: Source IP,
Destination IP. For full information about Hash and MinMiss Hash, see Load
Balancing Metrics for Transparent Routing FWLB on page 202. For full information
on selecting a load balancing metric, see Selecting a Load Balancing Metric on page
204.

Health Check

In order for the P333R-LB to perform a health check, an IP address beyond the
firewall should be configured as a health check address. The health check session
returns through the same firewall according to the NAT address it was given. For
information on configuration, see the configuration example.

Persistency

As in the case of Transparent Routing Firewalls, Non-Transparent Routing
Firewalls perform Statefull Inspection on all packets going through them, checking
that all the packets of a given session traverse the same firewall in both directions.
In transparent FWLB, persistency is ensured by the Load Balancing device. In non-
transparent FWLB, the firewalls ensure persistency through NAT, and there is no
need for the Load Balancing device to intervene.
210 Avaya P333R-LB User's Guide