Task 2: Change the Default IP Address Base (Optional)

You might have to change the default IP address base of the XC private networks if the default values conflict with another IP address base at your site. The address base is stored in a .ini file, and the file you modify depends on whether or not HP server blades and enclosures are included in the hardware configuration.

base_addr.ini file: Modify this file if the hardware configuration does not contain HP server blades and enclosures.
base_addrV2.ini file.: Modify this file if the hardware configuration contains HP server blades and enclosures. If you modify the IP addresses in the base_addrV2.ini file, you must make the same modifications to the corresponding parameters in the base_addr.ini file.

Follow this procedure to change the default IP address base for the XC private networks:

Begin this procedure as the root user on the head node.

Use the text editor of your choice to edit either the /opt/hptc/config/base_addr.ini file or the /opt/hptc/config/base_addrV2.ini file.

Example 3-1 shows the default content of the base_addr.ini file.

Example 3-1 Default Content Of The base_addr.ini File

Base = 172
nodeBase = 172.20
cpBase = 172.21
swBase = 172.20.65
icBase = 172.22
otherBase = 172.23.0
netMask = 255.224.0.0

Example 3-2 shows the default content of the base_addrV2.ini file.

Example 3-2 Default Content Of The base_addrV2.ini File

Base = 172
nodeBase = 172.20
cpBase = 172.21
swBase = 172.20.65
icBase = 172.22
otherBase = 172.23.0
netMask = 255.224.0.0
dyStart=172.31.48.1 1
dyEnd=172.31.63.254 2

1 2	The `dyStart` and `dyEnd` parameters are present only in the `base_addrV2.ini` file and do not need to be in the `base_addr.ini` file. If you change these IP addresses, do not add these parameters to the `base_addr.ini` file.

The following describes the parameters in this file:

Base: The common first octet that is used for all base IP addresses.
nodeBase: The base IP address of all nodes.
cpBase: The base IP address of the console branch.
swBase: The base IP address of the Ethernet switches. The interconnect switch modules are based off of this value, 172.20.66.*.
icBase: The base IP address of the interconnect.
otherBase: The base IP address to be used for other devices. This value is currently not used by the discovery process.
netMask: The netmask that is used for all connections on the administration network.
dyStart: The start of the dynamic IP address range used during the discovery process. This parameter is present only in the base_addrV2.ini file.
dyEnd: The end of the dynamic IP address range used during the discovery process. This parameter is present only in the base_addrV2.ini file.

Follow these guidelines if you make changes to the base_addr.ini or base_addrV2.ini files:
- Change only the first two octets of a base address.
- Use the same first two octets for all base IP addresses.
- Use a private domain as defined by the RFC.
- Verify that the netmask is correct for the changes you make. Otherwise, the discover process fails.
Save the changes to the file and exit the text editor. Because this is a read-only file, the method by which you save the file depends upon the text editor you used.
For example, if you are using the vi text editor, enter :w! to save changes to a read-only file.
If you made changes to the IP addresses in the base_addrV2.ini file, repeat steps 1 through 4 to edit the base_addr.ini file and make the same changes.

Proceed to “Task 3: Run the cluster_prep Command to Prepare the System” .

Task 2: Change the Default IP Address Base (Optional)

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