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Change the IP Address Version

IBM Cognos 8 supports two IP address versions: IPv4 and IPv6. IPv4 uses 32-bit IP addresses and IPv6 uses 128-bit IP addresses. For example:

In IBM Cognos Configuration, you can select IPv4 or IPv6 for IBM Cognos 8 communication using the IP Version for Host Name Resolution property. By default IPv4 is employed.

The setting applies only to the computer where it is set. If you selectPrefer IPv4 stack, all outgoing IBM Cognos 8 connections on that computer are established using IPv4 and the dispatcher accepts only incoming IPv4 connections. If you select Prefer IPv6 addresses, all outgoing IBM Cognos 8 connections on that computer are established using IPv6 and the dispatcher accepts both incoming IPv4 and IPv6 connections.

IPv4 client computers can communicate with dispatcher computers that are configured for IPv6.

Hostnames specified within a URI are resolved based on the value of the Network Configuration property. However, if a URI has been specified with a numeric address, it has precedence over this setting and communication takes place using IPv4.

The setting applies only to the computer where it is set. If you selectUse IPv4 addresses, all outgoing IBM Cognos 8 connections on that computer are established using IPv4 and the dispatcher accepts only incoming IPv4 connections. If you select Use IPv6 addresses, all outgoing IBM Cognos 8 connections on that computer are established using IPv6 and the dispatcher accepts both incoming IPv4 and IPv6 connections.

IPv4 client computers can communicate with dispatcher computers that are configured for IPv6.

Hostnames specified within a URI are resolved based on the value of the IP Version for Host Name Resolution property. However, if a URI has been specified with a numeric address, it has precedence over this setting and communication takes place using IPv4.

For IBM Cognos Configuration to accept IPv6 addresses in the local URI properties, you must start IBM Cognos Configuration with the -ipv6 option. You can specify the option each time you open IBM Cognos Configuration from the command line.

On Windows, you can set the option permanently by adding the option to the Start menu shortcut.

Steps to Set the IP Version

  1. Start IBM Cognos Configuration.

  2. In the Explorer window, click Environment.

  3. Click the Value box for IP Version for Host Name Resolution and click Use IPv4 addresses or Use IPv6 addresses.

  4. From the File menu, click Save.

  5. Close IBM Cognos Configuration.

Steps to to Manually Enable the IPv6 Option When Opening IBM Cognos Configuration

  1. Go to the c8_location\bin directory.

  2. Start IBM Cognos Configuration by including the IPv6 option in the command, as follows:

  3. Edit the URI properties that use IPv6 format, specify the values, and then from the File menu, click Save.

Steps to Always Open IBM Cognos Configuration With the IPv6 Option on Windows

  1. From the Start menu, select Programs, IBM Cognos 8, and then right-click IBM Cognos Configuration, Properties.

  2. On the Shortcut tab, in the Target box, type

    "c8_location\bin\cogconfigw.exe -ipv6"

  3. Click OK.