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2_x:datamodel:ip-addresses

IP Addresses

Obviously, IP Address objects in TeemIp modelize addresses of the Internet Protocol. Both version 4 and version 6 are supported.

IP Address Properties

Name Type Mandatory?
General Information
Organization Foreign key to a(n) Organization Yes
Status Possible values: allocated, released, reserved, unassigned Yes
Usage Foreign key to a(n) IP Address Usage No
Note Multiline character string No
Requestor Foreign key to a(n) Person No
Allocation date Date (year-month-day) No
Release date Date (year-month-day) No
DNS Information
Short Name Alphanumeric string No
Domain Name Foreign key to a(n) Domain No
FQDN Alphanumeric string No
Aliases Array of alphanumeric strings No
IP Information
Subnet Foreign key to a(n) Subnet No
Range Foreign key to a(n) IP Range No
Address Alphanumeric string Yes
IP Address Usages are typology elements defined in the Data Administration module. One set of IP Adress Usage needs to be defined per organization.
The attribute “Status” is more than informative. It does have an impact on what can and cannot be done with an IP. Meanings of different values are:
  • allocated: IP is in use and potentially allocated to a CI. It cannot be re-allocated to another CI without being released or unassigned first.
  • released: IP is not in use anymore and can be re-allocated if required
  • reserved: IP is not in use yet but will be allocated (activated) at a point in time. It can be allocated from the IP detail menu but is invisible from the CI edition menu.
  • unassigned: IP exists in TeemIp without any clear status and can be allocated or reserved.

Tabs

Tab Description
Contacts All the contacts for this IP
Documents All the documents linked to this IP
Notifications List of related notifications - Present if a notification trigger exists for that class
NAT IPs All other IPs linked to this IP in a NAT relationship
CIs All the configuration items configured with the IP
History History of all changes made to the IP

Listing IP Addresses

The IP Addresses shortcuts of the IP Management module on the explorer menu display all the IPv4 or IPv6 Addresses of the selected organization or all IPv4 or IPv6 Addresses if no organization is selected.

The Search tab will shorten the list according to the filtering elements you'll define in it.

Creating a new IP Address

From the listing view, click on the “New…” menu to display the creation form.

An implicit but intuitive set of rules are followed when an IP address is created:

  • “Allocation date” and “FQDN” (Fully Qualified Defined Name) are automatically calculated when the address is created,
  • If no Subnet is selected, the IP can be any IP of the IPv4 (or IPv6) space,
  • If a Subnet and no Range are selected, the address must be included into the Subnet,
  • If a Subnet and a Range are selected, the address must be included into the Range as well,
  • When attached to a CI, the “Short Name” is computed according to a method defined, by default, at the FunctionalCI level - see CMDB Core chapter,
  • An IP can be linked to any other registered IP address through the NAT tab.
By definition, FQDNs are absolute domain names. They specify the exact location of domain names in the tree hierarchy of the Domain Name System (DNS). This is why they end up with a dot.
Though aliases are linked to FQDNs, they can be created through the IP address creation screen. The “Aliases” box allows IP administrators to create as many aliases they want. Syntax is to add one FQDN by line, separated by a carriage return.

At creation time, global settings “Allow Duplicate Names” and “Ping IP before assigning it ?” can be overwritten. Note that a change on these parameters, if any, only applies to the current creation and don’t affect the value of the global parameters. If it is required to change them globally, these can be changed through the Global IP Settings menu of the Data Administration module.

For v6 IPs, a simple autocompletion mechanism is used to help typing the IP: its first 64 bits are copied from the subnet IP… which can, of course, be manually changed by the user.

Modify an IP Address

From the detailed view of an IP Address, click on the “Modify” button.

Basically, all parameters can be changed here but, of course, the IP address itself.

Other Actions

Next to standard actions, a set of specific actions can be applied to IP Addresses. These can be found in the “Other Actions” menu available from the details page.

These specific actions are described in below chapters.

Allocate Address to CI

This action applies to IP Addresses that are released, reserved or unassigned. Its purpose is to allocate the address to a CI without having to open the modification form of the targeted CI.

Three parameters control the action:

Name Type Mandatory?
Target class List the instantiated classes of objects that may be linked to an IP address Yes
Functional CI List the CIs of class defined by Target class which an IP address can be allocated to Yes
IP Attribute IP attribute of the CI that the IP should be allocate to Yes

These parameters are automatically computed and may differ from one data model to another. For instance, a server may have only one IP address (it's management IP, like in the standard data model) or multiple ones (a management and a backup IP). Once the CI is selected, TeemIp confirms the operation through the following screen.

As soon as the action is done, the IP address status is changed to “allocated”.
An IP can NOT be allocated to an IP interface that way.

Un-allocate address from all CI

This action simply unallocate the IP from all CIs that it may be allocated to. This includes IP Interfaces. Action is launched as soon as the action is selected. A confirmation screen is then displayed.

The IP address status is automatically changed to “unassigned”.

TeemIp has been designed to provide a comprehensive modelization and documentation of the link(s) that a CI and an IP address may share together.

Some CIs, like servers or network devices, have one IP attribute that represents their management IP. For them:

  • A unique IP can be attached to them,
  • An IP address must be in the status Released or Unassigned to be attached to a CI,
  • IPs that are in state Allocated cannot be set as IP Management attribute and reserved IPs are… reserved,
  • Once CI is created or updated, status of attached IP is automatically changed to Allocated,
  • If an Management IP is removed from the CI, its status becomes Unassigned unless it is still linked to another CI.

Some others CIs, like IP interfaces attached to routers, may host several IP addresses. For them:

  • One or more IPs (with no limitation of quantity) can be attached to them,
  • An IP can be attached to them, regardless their status,
  • Once CI is created or updated, status of attached IP is automatically changed to Allocated,
  • If a link with an IP address is removed, status of IP moves back to Unassigned unless it is still linked to another CI.
You may alter this default datamodel through an extension and add, for instance, a backup IP to your servers. There is no limitation to what you can do here…

Impact of CIs' life cycle to IPs

Changes on CIs may have an impact on IPs. Here is what happens when…

- A Functional CI is created
  • It is checked if the CI has IP Attributes,
  • For each of these that do point to an IP:
    • Status is set to allocated,
    • Short name attribute is computed.
- A Functional CI is updated
  • It is checked if the CI has IP Attributes,
  • For each of these:
    • Status of IP is updated if IP has changed (new IP is set to allocated and previous one is set to released),
    • Short name is changed if the CI name has changed.
- A Functional CI is deleted
  • It is checked if the CI has IP Attributes,
  • For each of these that do point to an IP:
    • Status is set to released,
    • Short name attribute is reset to empty string.
- A functional CI becomes obsolete
  • Its IPs may automatically be released from it, as described in the related CMDB chapter.

Releasing IPs

When an IP is set to the status “Released”, it is automatically removed from all CIs and all interfaces.

Continuous IP status coherency check

TeemIp may automatically and periodically check the status of IPs and their coherency with the CIs they are attached to, if any. This behaviour is driven by a set of parameters defined in Global IP Settings. For any given organization, should the configuration parameter… :

  • “Allocate IPs attached to production CIs” be set, TeemIp will make sure that IPs attached to CIs are “Allocated”.
  • “Release IPs from CIs that become obsolete” be set, TeemIp will release all IPs that are still allocated to obsolete CIs,
  • “Release IPs from subnets that are released” be set, TeemIp will release all IPs that belong to released subnets.
2_x/datamodel/ip-addresses.txt · Last modified: 2020/08/12 21:26 by cnaud