Subnets management

To work with subnets in DCImanager 6, go to Network → IP subnets. In this section, you can:

• add or remove a IPv4 or IPv6 subnet;
• change network settings;
• view the h istory of actions in the subnet;
• reserve an IP address.

Network hierarchy

You can create subnets of two types:

• Container — a subnet that allows creating child subnets within it for convenient IP address management. IP addresses of such a subnet can only be occupied by child subnets; they cannot be allocated to devices or pools;
• Active — a subnet from which you can allocate IP address pools and IP addresses for devices. Such a subnet cannot have child subnets.

A child of a subnet with the Container type can also have the Container type and its own child subnets.

If a subnet with the Container type has no children, you can change its type from Container to Active when modifying the subnet settings. The platform does not support changing the subnet type from Active to Container.

If the address space of subnet B is completely within the address space of Container subnet A, then subnet A is the parent subnet, and B is a child. The platform automatically determines whether a created subnet is a child or parent of another subnet. For example, if you have a subnet 10.16.0.0/16 with the Container type, then a created subnet 10.16.10.0/24 will automatically become its child.

To see the list of subnets in a hierarchical view, go to the Networks → IP subnets section and click Show nesting. After this:

• all table filters will be disabled;
• networks will be sorted by hierarchy. For example:
  • networks without children or parent subnets;
  • parent subnet 1;
    • first-level child subnet 1;
      • second-level child subnet 1;
    • first-level child subnet 2;
  • parent subnet 2;
    
    • child subnet;
• In the Network column, the number of dots in each row indicates how many parent subnets are located above that subnet in the hierarchy.

To see the list of child and parent subnets:

1. Go to the Networks → IP subnets section → click on the desired subnet → Networks.
2. Click Parent or Child.

How to create a subnet

To create a subnet: 

1. Go to Network → IP subnets → Create a subnet.

2. Specify a Network in the following format <network IP address>/<network mask prefix>. E.g. "172.0.0.0/24" or "2001:0db8:85a3:0001::/64".

   Prefix lengths greater than 64 are not supported for IPv6 subnets.
3. Specify a subnet type:
   • Active;
   • Container.

4. If the subnet type is Active, specify a Gateway. 

   The gateway must be one of the subnet addresses.
5. If the subnet will be used at all locations, enable the option The subnet is accessible on all locations .

6. If needed, specify the subnet information:

   • VLAN id;
   • DNS servers;
   • NTP servers.
   These field are for information only. They do not affect subnet in any way.
7. Specify an arbitrary Note to thesubnet.
8. To create an IP pool:
   1. Select the Create an IP pool and range checkbox. 
   2. Enter a Pool name. 
   3. Specify the IP range from the subnet that can be used for the pool. You can enter a single IP address ("1.1.1.1"), a mask ("1.1.1.1/24") or a range ("1.1.1.1-1.1.1.5").
   4. Enable the pool on the cluster nodes. 
9. Click Create.

Changing subnet settings

To change your subnet settings, go to Network → IP subnets → select subnet → menu → Settings.

To delete a subnet, go to Network → IP subnets → select network → menu → Delete network.

History of actions in the network

To view the history of actions, go to Network → IP subnets → select the network → History. The history page displays information about:

• adding and removing IP addresses;
• changing the domain name for the IP address.

Managing PTR Records

To view PTR records associated with network addresses, go to Networks → IP subnets → select the network → PTR Records.

To add PTR records:

1. Go to Networks → IP subnets → select the network → PTR Records.
2. Click Add PTR Records.
3. Specify the records in the format <network address> <domain name>. For example, "<10.16.16.10> <ntp.example.com>". You can use IPv4 and IPv6 addresses.
4. Click Add PTR Records.

Managing IP addresses

To view all IP addresses used, enter Networks → IP subnets → select the subnet. You can filter the list of addresses on this tab by IP address or hostname. In the Note column, you can add a comment to the IP address.

You can reserve individual IP addresses in the subnet. DCImanager 6 will not use these addresses when assigning IP addresses to equipment.

To reserve an IP address, click Assign IP addresses:  

1. Specify the IP address or subnet.
2. Specify the Host name.
3. To prevent the IP address from being deleted, enable the Protect the IP address from accidental deletion option.
4. Specify a discretionary Note.
5. Press Apply.

Networks management

Free IP addresses

To view free addresses on an IPv4 network, go to Networks → select a network → IP addresses tab → Free tab.

To check if a specific address or range of addresses is free, click Check IP addresses → enter the IP address or range (e.g. 192.168.1.1.1-192.168.1.10) → Search button.

To find a free range of IP addresses, click Search any → enter the Number of free IP addresses in a row → Search button.

You can reserve free IP addresses:

1. If you need to reserve one address, select the row with that address and click the Occupy IP address button. If you need to reserve multiple addresses, select the rows with the desired addresses and click the occupy ip addresses button in the table header.
2. Specify the Domain name for which the address will be reserved.
3. To ensure that the IP address cannot be deleted, enable the Protect the IP address from accidental deletion option.
4. Enter an arbitrary Comment.
5. Click the Allocate IP address button.