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IP Reservation in Isolated Guest Networks
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• Domain: The domain associated with the account.
16.15. IP Reservation in Isolated Guest Networks
In isolated guest networks, a part of the guest IP address space can be reserved for non-
CloudPlatform VMs or physical servers. To do so, you configure a range of Reserved IP addresses
by specifying the CIDR when a guest network is in Implemented state. If your customers wish to have
non-CloudPlatform controlled VMs or physical servers on the same network, they can share a part of
the IP address space that is primarily provided to the guest network.
In an Advanced zone, an IP address range or a CIDR is assigned to a network when the network is
defined. The CloudPlatform virtual router acts as the DHCP server and uses CIDR for assigning IP
addresses to the guest VMs. If you decide to reserve CIDR for non-CloudPlatform purposes, you can
specify a part of the IP address range or the CIDR that should only be allocated by the DHCP service
of the virtual router to the guest VMs created in CloudPlatform. The remaining IPs in that network are
called Reserved IP Range. When IP reservation is configured, the administrator can add additional
VMs or physical servers that are not part of CloudPlatform to the same network and assign them the
Reserved IP addresses. CloudPlatform guest VMs cannot acquire IPs from the Reserved IP Range.
16.15.1. IP Reservation Considerations
Consider the following before you reserve an IP range for non-CloudPlatform machines:
• IP Reservation is supported only in Isolated networks.
• IP Reservation can be applied only when the network is in Implemented state.
• No IP Reservation is done by default.
• Guest VM CIDR you specify must be a subset of the network CIDR.
• Specify a valid Guest VM CIDR. IP Reservation is applied only if no active IPs exist outside the
Guest VM CIDR.
You cannot apply IP Reservation if any VM is alloted with an IP address that is outside the Guest
VM CIDR.
• To reset an existing IP Reservation, apply IP reservation by specifying the value of network CIDR in
the CIDR field.
For example, the following table describes three scenarios of guest network creation:
Case CIDR Network CIDR Reserved IP
Range for Non-
CloudPlatform
VMs
Description
1 10.1.1.0/24 None None No IP
Reservation.
2 10.1.1.0/26 10.1.1.0/24 10.1.1.64 to
10.1.1.254
IP Reservation
configured by the
UpdateNetwork
API with
guestvmcidr=10.1.1.0/26
or enter
10.1.1.0/26 in the