At AppNexus every customer has a private VLAN, or Virtual Local Area Network, in each datacenter where they operate equipment. Your VLAN is a list sequential of IP addresses to be assigned to the instances you launch in the AppNexus environment. Your VLAN can consist of 8, 24, 56 or 120 IP addresses;eight addresses in each range are reserved for networking equipment so it can behave as though it was part of your indiviudal VLAN.
VLANs provide security by segregating each customer's traffic from AppNexus and other customers' traffic and also by regulating traffic from the Internet via a customer-controlled Access Control List (ACL).
If you outgrow a VLAN, AppNexus will assign you a larger one. This can take up to one workday as support staff configures the ACL for the new VLAN. You will then need to migrate instances from the old VLAN to the new one. This can be done without downtime; you will assign each item in your VLAN a second IP address for the duration of the migration. Detailed instructions on VLAN migration will be provided when you make your request to Support.
You can assign specific IP addresses to your equipment by using the optional "--ip" parameter for the
manage-instance launch command. For more information, see manage-instance.