Citrix Systems 4.2 manual Portable IPs, About Portable IP

Portable IPs

Note

Inbound NAT (INAT) is a type of NAT supported by NetScaler, in which the destination IP address is replaced in the packets from the public network, such as the Internet, with the private IP address of a VM in the private network. Reverse NAT (RNAT) is a type of NAT supported by NetScaler, in which the source IP address is replaced in the packets generated by a VM in the private network with the public IP address.

•This default public IP will be released in two cases:

•When the VM is stopped. When the VM starts, it again receives a new public IP, not necessarily the same one allocated initially, from the pool of Public IPs.

•The user acquires a public IP (Elastic IP). This public IP is associated with the account, but will not be mapped to any private IP. However, the user can enable Static NAT to associate this IP to the private IP of a VM in the account. The Static NAT rule for the public IP can be disabled at any time. When Static NAT is disabled, a new public IP is allocated from the pool, which is not necessarily be the same one allocated initially.

For the deployments where public IPs are limited resources, you have the flexibility to choose not to allocate a public IP by default. You can use the Associate Public IP option to turn on or off the automatic public IP assignment in the EIP-enabled Basic zones. If you turn off the automatic public IP assignment while creating a network offering, only a private IP is assigned to a VM when the VM is deployed with that network offering. Later, the user can acquire an IP for the VM and enable static NAT.

For more information on the Associate Public IP option, see Section 10.5.1, “Creating a New Network Offering”.

Note

The Associate Public IP feature is designed only for use with user VMs. The System VMs continue to get both public IP and private by default, irrespective of the network offering configuration.

New deployments which use the default shared network offering with EIP and ELB services to create a shared network in the Basic zone will continue allocating public IPs to each user VM.

16.19. Portable IPs

16.19.1. About Portable IP

Portable IPs in CloudPlatform are region-level pool of IPs, which are elastic in nature, that can be transferred across geographically separated zones. As an administrator, you can provision a pool of portable public IPs at region level and are available for user consumption. The users can acquire portable IPs if admin has provisioned portable IPs at the region level they are part of. These IPs can be use for any service within an advanced zone. You can also use portable IPs for EIP services in basic zones.

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