Managing VM IP addresses

When a virtual machine (VM) is created, VMmanager allocates to it an IP address from a specified pool. You can assign additional IP addresses to VMs or delete existing ones. To manage IP addresses, enter Virtual machines → select VMs → IP addresses .

You can configure IP addresses to be checked before the platform allocates them to virtual machines (VMs). If the IP address fails verification, VMmanager will not assign it to the VM. For example, you can prevent the issuance of IP addresses assigned to any devices on the network. For more information, see How to set up an IP check before allocation?

Adding an IPv4 address

You can choose the type for adding an IPv4 address to a VM. The file to which the network configuration will be written depends on the selected type:

If VM has network interfaces added manually by the OS, it is recommended to select the none model.

Changing the type may fail with error 5991 "Ip automation not available" if:

• there is a network interface in the VM settings in the platform that is not actually exists on the VM;
• the VM settings in the platform have IP addresses that are not actually exists on the VM;
• VM was imported from VMmanager 5 and automatic synchronization of network interfaces is not completed.

To add IPv4 addresses:

1. If necessary, change the IP address add type. By default, VMmanager automatically selects the type that corresponds to the operating system.
2. Press Add an IP address.
3. Select the Pool from which IP addresses will be allocated , or click Assign IP to enter a specific address .
4. Select the required Number of IPv4 addresses.
5. Press Add.

Additional IPv4 addresses will be added to the network configuration of the VM with the /32 prefix.

Because of the nftables subsystem, if more than 1000 IP addresses are allocated to all VMs on a cluster node, network bandwidth will be significantly reduced. To avoid this problem, disable restrictions on the number of TCP connections in the VM's fine-tuning.

To delete an IP address, press → Delete .

IPv4 tab

Adding an IPv6 address

To add an IPv6 address:

1. Go to the IPv6 tab.
2. Press Enable IPv6 .
3. Select IPv6 pool.

4. Select Subnet prefix from /32 to /125. 

   

   The subnet prefix must be greater than the network prefix.

5. Press Enable IPv6 .

The platform will allocate a subnet of IPv6 addresses for the VM. The first address from the subnet will be automatically assigned to the VM interface. Network settings will need to be added to the VM manually. Read more in Assigning IP addresses with OS tools.

To disable IPv6 addressing, press Network parameters → Disable → Disable IPv6 .

Read more about IPv6 in Managing IPv6 .

IPv6 network settings

PTR records for IPv6 addresses

PTR records are needed so that the DNS server can determine the domain name of a VM by its IP address. These records are used for some Internet services (e.g., sending email).

The main VM domain is automatically linked to the first two IPv6 addresses from the allocated subnet. For example, subnet 2a01:230:2:3::8/125 is allocated to cosmos-diamond.example.com VM. The platform will automatically create PTR records linking the domain cosmos-diamond.example.com to the IP addresses 2a01:230:2:3::8 and 2a01:230:2:3::9.

To manage PTR records, configure integration with DNSmanager 6 and enter Virtual machines → select the VM → IP addresses → IPv6 .

To create an additional PTR record for a VM:

1. Press Add a PTR-record .
2. Enter the IPv6 address and the Domain it should correspond to.
3. Press Add .

To change the record settings, press .

To delete the record, press .

Configuring PTR records