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Web OS 10.0 Application Guide
Advanced FWLB Concepts
Free-Metric FWLB
Free-metric FWLB allows to you use load-balancing metrics other than hash, such as
leastconns, roundrobin, minmiss, response, and bandwidth for more versatile
FWLB.
The free-metric method uses the Return to Sender (RTS) option. RTS can be used with basic
FWLB or four-subnet FWLB networks.
Free-Metric with Basic FWLB
For this example, review the basic FWLB example network.
Internet
Figure 13-8 Basic FWLB Example Network
To use free-metric FWLB in this network, the following configuration changes are necessary.
1.
On the clean-side Web switch, enable RTS on the ports attached to firewalls (ports 2 and 3).
>> # /cfg/slb/port 2/rts enable
>> # ../port 3/rts enable
2.
On the dirty-side Web switch, remove the redirection filter from the ports attached to the
real servers (ports 4 and 5), but make sure filter processing is enabled.
>> # ../port 4/rem 224
>> # filt ena
>> # ../port 5/rem 224
>> # filt ena
n
346
Chapter 13: Firewall Load Balancing
"Dirty" Side
Dirty Side:
10.1.1.10
Web Switch 1
IF1: 192.16.12.1
2
1
3
IF2: 10.1.1.1
IF3: 10.1.2.1
Dirty Side:
10.1.2.10
"Clean" Side
Firewall 1
Web Switch 2
Clean Side:
IF1: 20.1.1.1
10.1.3.10
Virtual Server:
Firewall 2
Clean Side:
10.1.4.10
Servers
20.1.1.10
2
4
20.1.1.2
3
5
IF2: 10.1.3.1
IF3: 10.1.4.1
20.1.1.3
212777-A, February 2002
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