Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 367)

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The output should look like this:

lo:dsr Link encap:Local Loopback

inet addr:cluster-ip Mask:255.255.255.255

UP LOOPBACK RUNNING MTU:16436 Metric:1

3. To configure an Apache 2.0 server for DSR, edit the server configuration file to add a Listen directive for the

cluster IP (on many systems, the configuration file is found at /usr/local/etc/apache/httpd.conf). Look for

the first line beginning with the Listen directive, and add another line that looks like this:

Listen cluster-ip

Where cluster-ip is the DSR-enabled cluster IP. Save your changes to the file.

4. Reboot the Apache server:

# apachectl restart

You should now be able to send client requests to the cluster IP and port, and get responses directly from the

Apache server running on Linux. Remember that static routes on your servers may be necessary, depending on

your network configuration.

Configuring a Loopback Interface on Other Systems for DSR

The commands and interfaces used to configure a loopback interface vary slightly between operating systems,

and sometimes between versions of the same operating system. Check the documentation for your server

operating system for instructions on how to configure a loopback interface. For example, on some BSD systems,

the command used in Step 1 in the previous section would be slightly different, as shown below:

# ifconfig lo0 cluster-ip netmask cluster-netmask alias

Notice that in this case, the netmask used matches the netmask used to configure the cluster on Equalizer,

instead of 255.255.255.255 as in the Linux system example.

Weak and Strong Host Models and DSR

Network interfaces on non-routing systems use either the “weak host” or “strong host” models for packet

transmission and reception (these models are defined in RFC1122). In the “strong host” model, a system that is

not acting as a router cannot send or receive any packets on a given interface unless the destination/source IP in

the packet is assigned to the interface. In the “weak host” model, this restriction does not apply.

In order for DSR to work, the “weak host” model must be enabled on the server’s loopback interface, as well as the

interface on which requests are received from Equalizer.

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