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Web OS 10.0 Application Guide
TCP Health Checks
TCP health checks are useful in verifying user-specific TCP applications that cannot be
scripted.
Session switches monitor the health of servers and applications by sending Layer 4 connection
requests (TCP SYN packets) for each load-balanced TCP service to each server in the server
group on a regular basis. The rate at which these connection requests are sent is a user-config-
urable parameter. These connection requests identify both failed servers and failed services on
a healthy server. When a connection request succeeds, the session switch quickly closes the
connection by sending a TCP FIN (finished) packet.
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particular service.
ICMP Health Checks
Configure the switch with ICMP health check to verify if the real server is alive. The Layer 3
echo - echo reply health check is used for UDP services or when ICMP health checks are
configured.
1.
Select the health check menu for group 1.
>> # /cfg/slb/group 1
2.
Set the health check type to ICMP for group 1.
>> # Real server group 1# health icmp
3.
Apply and save your configuration.
>> # Real server group 1# apply
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Chapter 10: Health Checking
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TCP health check is a default health check after you have configured the switch for a
212777-A, February 2002
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