This topic describes frequently asked questions about VPC.

What is the difference between a VPC and a classic network?

The following describes the differences between a VPC and a classic network:
  • Services that use the classic network are deployed in the public infrastructure of Alibaba Cloud, and planned and managed by Alibaba Cloud. The classic network is suitable for users who require high network usability.
  • VPC is an isolated virtual network environment built on Alibaba Cloud. VPCs are logically isolated from each other. You can customize the topology and IP addresses in a VPC. Compared with a classic network, a VPC is suitable for users who have network management capabilities.

Can I bind multiple network interface controllers (NICs) to an ECS instance?

A classic network ECS instance contains two network interface controllers, a public NIC, and an internal NIC. By default, a VPC-type ECS instance supports only one internal NIC. Certain types of ECS instances can be bound to multiple Elastic NICs. For more information, see ENI overview.

Can a VPC have multiple VRouters?

No. Each VPC can have only one VRouter and each router can have multiple route tables.

How many custom route entries can I create in a route table?

By default, you can create up to 48 custom route entries in a route table. To increase the quota, submit a ticket.

How many VSwitches can I create in a VPC?

By default, you can create up to 24 VSwitches in a VPC. To increase the quota, submit a ticket.

How many private IP addresses can be used for the Alibaba Cloud services in each VPC?

A maximum of 60,000 private IP addresses can be used by each VPC. The quota cannot be increased.

For example, if an Elastic Compute Service (ECS) instance has only one private IP address, the ECS instance uses one IP address. If an ECS instance is bound to multiple NICs or an NIC has multiple IP addresses configured, the number of IP addresses used by the ECS instance is the sum of the IP addresses assigned to the NICs that is bound to the ECS instance.