This AppNote discusses IP Address Management, a centralized framework that stores and displays the IP address:port configuration of applications present on a server. This AppNote starts off with a discussion of several common IP address configuration scenarios.
A change in a server's IP address can cause many critical applications to become broken and remain broken even after a server reboot. There are so many different configuration files that it is difficult for the administrator to know which configuration files need to be edited. The administrator is not able to easily tell if an application is configured with a conflicting port (one that is already in use by another application). There are numerous scenarios that commonly occur involving changes to IP address and port configurations. Applications that bind to a specific IP address.In the case of applications that bind only to a specific IP address, these applications stop working if the IP address is changed.
Applications that bind to a non-specific address (default IP).In this case, it does not matter which IP address these applications listen on as long as they get one of the IP addresses on the server. Applications that do not compete for ports.Applications that do not compete for ports toggle between the valid and invalid status. The IP Address Management framework is designed to help you deal with these problems and scenarios more effectively.
The framework pushes any change in IP address information to an application's local configuration file so that when the application restarts, it gets the correct information.
You can easily see what is happened with the IP addresses and port within the server through the NetWare Remote Manager snap-in. VALID: The application is configured with an IP address that is available on the server (shown in the IP address list).
INVALID: The application is configured with an IP address that is not available on the server (not shown in the IP address list).
From this centralized list, you can easily edit the IP address configurations and resolve any invalid or conflicting assignments. Through the IP Address Management framework, you can also display the list of configured IP addresses on the server, and schedule changes to an application's IP address configuration at a specified date and time. Figure 1 illustrates the internal processes that take place when an application uses the IP Address Management framework as a reference. If the application is configured with the default IP address, the IP Address Management utility takes care of updating the application configuration information with the updated IP address for such applications. A follow-up AppNote will cover the process of integrating applications with the IP Address Management framework in more detail. The modification tool can either be provided with the application, or an administrator can write a tool to reconcile the changes using the new framework (see Figure 2). In NetWare 6.5, you can use the NetWare Remote Manager (NRM) to view the IP Address Management framework.
Here is a brief explanation of the options available on the IP Address Management main page.
Show Configured IP Addresses.Use this option link to view the configured IP addresses on the server.
Schedule Configuration Change.Use this option link to schedule configuration changes for applications by selecting the date and time when the changes need to take place.
Restart Server.Use this option link to restart the server once all applications are displaying the "Valid" status. With NetWare 6.0 and earlier versions, you must manually modify each configuration file separately to reflect the IP address change. Use the "Search and Replace" function within the text editor to make the necessary changes.


Using the IP Address Management framework with NetWare 6.5, you can edit the configuration information of all applications connected to the server from a single page. Figure 4: After an IP address change on the server, all applications display the "INVALID" status. The applications that are integrated with the IP Address Management framework in NetWare 6.5 are listed below. This AppNote has discussed the various functional aspects of the IP Address Management framework included with NetWare 6.5. The information provided in this AppNote is derived strictly from test scenarios; there may be deviations from these results in real user scenarios. The framework helps you in managing applications' IP address associations when changing a server's IP address. This AppNote explains how to install, configure, and maintain LDAP Contextless Login on your network.
It provides the infrastructure to support applications that use their own configuration files to get IP address and port information, as well as applications that want to use the framework to get the IP address and port information. It then introduces the functional features of the IP Address Management framework, provides a high-level architectural overview, and lists the benefits of using the framework. To successfully restart these broken applications, server administrators must perform extensive modification of numerous configuration files to reflect the changed IP address. Here are some scenarios that you might encounter when you need to change the IP address of a server. It provides a Web-based user interface to access the configuration information held within the framework. The administrator can modify the custom configuration files or databases using a different tool, and the modifications will be reflected in the IP Address Management framework. After starting NRM, select the "IP Address Management" link under the Manage Server category.
For the Restart Server link to appear on the IP Address Management page, you must change at least one application's configuration.
There may be up to seven references to the IP address that need to be changed: look for the "listen", "securelisten", and "redirect" commands. Make sure that all IP addresses within these files reflect the new IP address on the server.
The main page will now display the application with the "VALID" status, as shown in Figure 6. Novell does not recommend deploying any new configurations directly in a production network. While Novell makes all reasonable efforts to verify this information, Novell does not make explicit or implied claims to its validity. Such applications continue to work without any problem if an IP address on the server is changed. The framework also accommodates and displays any change in an application's configuration that is done outside the framework's user interface. To group the list by status, click the Group By () icon next to Status to change the display. Configuration changes should always be verified in a simulated test network before being deployed in a production environment. When the Grouped By () icon is visible next to a field, it indicates that the list is grouped by that field.




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