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Web OS 10.0 Application Guide
Using HTTP Health Checks
For those firewalls that do not permit ICMP pings to pass through, Web switches can be con-
figured to perform HTTP health checks, as described below.
1.
Set the health check type to HTTP instead of ICMP.
>> # /cfg/slb/group 1/health http
2.
Configure a "dummy" redirect filter as the last filter (after the redirect all filter) to force
the HTTP health checks to activate, as shown below:
>> # /cfg/slb/filt 225
>> Filter 224# proto tcp
>> Filter 224# action redir
>> Filter 224# group 1
>> Filter 224# rport http
>> Filter 224# ena
N
OTE
redirect filter.
n
352
Chapter 13: Firewall Load Balancing
–
Make sure that the number of each real filter is lower than the number of the "dummy"
(Select HTTP health checks)
(Select filter 225)
(For TCP protocol traffic)
(Redirect the traffic)
(Set real server group for redirection)
(Set real server port for redirection)
(Enable the filter)
212777-A, February 2002
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