Web OS 10.0 Application Guide346 n Chapter 13: Firewall Load Balancing 212777-A, February 2002Advanced FWLB ConceptsFree-Metric FWLBFree-metric FWLB allows to you use load-balancing metrics other than hash, such asleastconns, roundrobin, minmiss, response, and bandwidth for more versatileFWLB.The free-metric method uses the Return to Sender (RTS) option. RTS can be used with basicFWLB or four-subnet FWLB networks.Free-Metric with Basic FWLBFor this example, review the basic FWLB example network.Figure 13-8 Basic FWLB Example NetworkTo 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).2. On the dirty-side Web switch, remove the redirection filter from the ports attached to thereal servers (ports 4 and 5), but make sure filter processing is enabled.>> # /cfg/slb/port 2/rts enable>> # ../port 3/rts enable>> # ../port 4/rem 224>> # filt ena>> # ../port 5/rem 224>> # filt ena"Dirty" Side "Clean" SideInternetFirewall 1Firewall 2ServersWeb Switch 1IF1: 192.16.12.1Web Switch 2IF1: 20.1.1.1Virtual Server:20.1.1.1020.1.1.220.1.1.3Dirty Side:10.1.2.10IF2: 10.1.1.1IF3: 10.1.2.1IF2: 10.1.3.1IF3: 10.1.4.1Dirty Side:10.1.1.10Clean Side:10.1.4.10Clean Side:10.1.3.101 232345
