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Health monitors

BIG-IP® Reference Guide 4 - 151

In transparent mode, the monitor is forced to ping through the node it is

associated with, usually a firewall, to the dest node. (In other words, if there

are two firewalls in a load balancing pool, the destination node will always

be pinged through the one specified and not through the one picked by the

load balancing method.) In this way, the transparent node is tested as well: if

there is no response, the transparent node is marked down. For more

information about transparent mode, refer to Using transparent mode, on

page 4-157.

In reverse mode, the monitor marks the node down when the test is

successful. For example, if the content on your web site home page is

dynamic and changes frequently, you may want to set up a reverse ECV

service check that looks for the string "Error". A match for this string

would mean that the web server was down. Transparent mode can also be

used with tcp_echo.

Transparent and reverse modes cannot be used on the same monitor.

Testing SQL service checks

SQL service checks may require manual testing before being implemented

in a monitor, as follows:

cd /usr/local/lib/pingers

./tdslogin 192.168.1.1 1433 mydata user1 mypass1

Replace the IP address, port, database, user, and password in this example

with your own information.

You should receive the message:

If you receive the connection refused message, verify that the IP and port are

correct.

If you are still having trouble, you should verify that you can log in using

another tool. For example, if you have Microsoft NT SQL Server version

6.5, there is a client program ISQL/w included with the SQL software. This

client program performs simple logins to SQL servers. Use this program to

test whether you can login using the ISQL/w program before attempting

logins from the BIG-IP.

On the SQL Server, you can run the SQL Enterprise Manager to add logins.

When first entering the SQL Enterprise Manager, you may be prompted for

the SQL server to manage.

You can register servers by entering the machine name, user name, and

password. If these names are correct, the server will be registered and you

will be able to click an icon for the server. When you expand the subtree for

the server, there will be an icon for Logins.

Underneath this subtree, you can find the SQL logins. Here, you can change

passwords or add new logins by right-clicking the Logins icon. Click this

icon to open an option to Add login. After you open this option, type the

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