Advanced Zone Guest IP Addresses

- IP Reservation in Isolated Guest Networks - In Isolated guest networks, a part of the guest IP address space can be reserved for - non-&PRODUCT; 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-&PRODUCT; 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 &PRODUCT; virtual router acts as the DHCP server and uses CIDR for assigning IP - addresses to the guest VMs. If you decide to reserve IP ranges for non-&PRODUCT; 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 &PRODUCT;. 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 &PRODUCT; to the same network and - assign them the Reserved IP addresses. &PRODUCT; guest VMs cannot acquire IPs from the Reserved - IP Range. -

- IP Reservation Considerations - Consider the following before you reserve an IP range for non-&PRODUCT; machines: - - - 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, specify the new value for the Guest VM 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-&PRODUCT; 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 CIDR field in the - UI. - - - 3 - 10.1.1.0/24 - None - None - Removing IP Reservation by the UpdateNetwork API with - guestvmcidr=10.1.1.0/24 or enter 10.1.1.0/24 in the CIDR field in the UI. - - - - - - - -

- Limitations - - - The IP Reservation is not supported if active IPs are found outside the Guest VM CIDR. - - - - Upgrading network offering which causes a change in CIDR (such as upgrading an - offering with no external devices to one with external devices) IP Reservation becomes - void if any. Reconfigure IP Reservation in the reimplemented network. - - -

- Best Practices - Apply IP Reservation to the guest network as soon as the network state changes to - Implemented. If you apply reservation soon after the first guest VM is deployed, conflict is - less likely to occur while applying reservation. -

- Reserving an IP Range - - - Log in to the &PRODUCT; UI as an administrator or end user. - - - In the left navigation, choose Network. - - - Click the name of the network you want to modify. - - - In the Details tab, click Edit. - - - - - edit-icon.png: button to edit a network - - - The CIDR field changes to editable one. - - - In CIDR, specify the Guest VM CIDR. - - - Click Apply. - Wait until the Network CIDR and the Reserved IP Range are displayed in the Details - page. - - -