During the Amazon VPC limited beta:
- You are limited to one VPC with one VPN connection (per AWS account)
- You can assign one IP address range to your VPC
- You cannot change the IP address range of a created VPC or subnet
- When you launch an instance in a subnet, AWS automatically assigns the instance an IP address from the IP address range the subnet covers; you cannot currently choose the specific IP address to use with the instance.
|No Direct Internet Access from a VPC
||Any VPC traffic to/from the Internet must currently route through the established VPN connection and through your existing IT infrastructure to the public Internet. You are currently unable to send/receive Internet traffic directly from your VPC.
|Unsupported AWS Services Only Accessible Via VPN Connection
||Amazon VPC allows you to deploy Amazon EC2 instances within your VPC. Resources provided by services such as Amazon S3, Amazon SQS, Amazon SimpleDB and others cannot currently be deployed within your VPC, and, as such, are only accessible to resources within your VPC via the VPN connection, through your network, and to the respective service's public endpoint. You may need to create firewall exceptions to allow cloud-based instances to access the Internet (and possibly NAT) from your existing IT infrastructure.
|Broadcast and Multicast Unsupported in a VPC
||You are unable to employ either broadcast or multicast within your VPC.
|Increased Latency in Bundling Linux/UNIX AMIs
||You may experience increased latency in bundling Linux/UNIX AMIs within Amazon VPC. Such bundles are transferred from the instance, through the VPN connection, through your network and to the public Amazon S3 endpoint. You may need to create firewall exceptions to allow cloud-based instances to access the Internet (and possibly NAT) from your existing IT infrastructure.
|Service Currently Available in One Availability Zone
||Currently your VPC, subnets, VPN gateway, and any instances you launch in the VPC must all reside in a single Availability Zone in the us-east-1 region.
|No Capacity Guarantee for Amazon EC2 Reserved Instances
||Reserved Instances (with their discounted rates) are available; however, there's currently no capacity guarantee for Reserved Instances in a VPC.
|Traffic Sent to Overlapping IP Address Ranges Is Dropped
||If your VPC's IP address range overlaps with an IP address range in use within your existing IT infrastructure, Amazon VPC will drop any traffic to said range. To avoid this, create your VPC so it does not overlap with current or expected future subnets in your network.
|Ordering of DHCP Option Values Not Guaranteed
||When you specify DHCP options, some options (e.g., DNS servers) accept multiple values. The ordering of these values is not guaranteed. After creating the options, you should use the DescribeDhcpOptions operation (or the ec2-describe-dhcp-options command) to confirm the order in which the options will be delivered to instances.
|AWS Capabilities Currently Unavailable within Amazon VPC
||The following AWS services and Amazon EC2 features are currently not available for use with a VPC:
- Security groups
- Elastic IP addresses
- Elastic Load Balancing
- Auto Scaling
- Amazon Elastic MapReduce
- Amazon DevPay paid AMIs