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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 that can to be assigned to the instances you launch on the AppNexus system. Your VLAN can consist of 8, 24, 56 or 120 IP addresses (;eight addresses in each range are reserved for networking equipment so they can act as if belonging to an individual VLAN). This VLAN provides that equipment will 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 controlling by regulating traffic from the Internet via a customer-controlled Access Control List (ACL).


  • By default we deny all inbound traffic from the Internet to your IP block is denied except for ping (ICMP Echo---used to verify that the host is up). Initial access rules are configured based on the customer questionnaire.For incoming traffic, customer may request ACL (Access Control Lists) change: for Customers can explicitly permit TCP/UDP/ANY , traffic for particular source and destination IPs and ports, request ALLOW or DENY rule.  Default rule is deny all explicitly permitted traffic is allowed to pass.Initial access rules are configured based on the customer questionnaire.
  • You will be assigned a separate VLAN in each datacenter where you have equipment. By default, all ports between your two VLANs in different datacenters will be open. Traffic between LAX1 and NYM1 travels over the Internet and is not encrypted.


  • At the moment, ACL changes must go through Support. Please see How to Request Firewall Changes for more information. Soon there will be an API for ACLs and you will also be able to use the customer portal. Relevant tickets: #4128 /#4625/#3952

If you run out of IP addresses in your VLAN

If you outgrow a VLAN, we can assign you a new, larger one. This can take up to one workday, and you will then have 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. You will get detailed instructions how to migration from one VLAN to another when you make your request to Support.

What about instructions:

1. When you launch new instance, please use "--ip" flag of "manage-instance launch" command to explicitly declare IP address of instance in new address block. - Really it'll be part of instruction - Vladimir

Meanwhile I'll prepare instructions on how to deal with multi-VLAN environment, how to migrate instances from old IP space to the new one with the existing API/CLI functionality, et cetera. - Actually Alexander Novitskiy is communicating with GiftReal (RT:5483) and OpenAds (RT:5118) on this.