Specifications

Chapter 4: Configuring the High-Level Network
4-140
Using tcp_echo
The tcp_echo template uses Transmission Control Protocol. The check is
successful if a response to a TCP ECHO message is received. tcp_echo also
supports transparent mode. In this mode, the node with which the monitor
is associated is pinged through to the destination node. (For more
information about transparent mode, refer to Using transparent and reverse
modes, on page 4-150.)
To use tcp_echo, you must ensure that TCP ECHO is enabled on the nodes
being monitored.
Working with templates for ECV monitors
ECV monitors attempt to retrieve explicit content from nodes using send
and recv statements. These include http, https and tcp.
Note
The templates http, https, and tcp are all usable as is, and you may
associate them with nodes. It is important to understand, however, that
using a template as is means that you are using the default attribute values.
To change any of these values, you have to configure a custom monitor
based on the template.
Using tcp
The tcp template is for Transmission Control Protocol. A tcp monitor
attempts to receive specific content. The check is successful when the
content matches the recv expression. A tcp monitor takes a send string and
a recv expression. If the send string is left blank, the service is considered
up if a connection can be made. A blank recv string matches any response.
monitor tcp_echo {
#type tcp_echo
interval 5
timeout 16
dest *
//transparent
}
Figure 4.55 The tcp_echo monitor template