# Connectivity

- Does a VPN Allow Communication Between Two VPCs?
- Why Are Internet or Internal Domain Names in the Cloud Inaccessible Through Domain Names When My ECS Has Multiple NICs?
- Are There Any Constraints on Using VPC Peering Connections?
- Why Did Communication Fail Between VPCs That Were Connected by a VPC Peering Connection?
- How Many VPC Peering Connections Can I Create?
- What Are the Priorities of the Custom Route and EIP If Both Are Configured for an ECS to Enable the ECS to Access the Internet?
- What Are the Priorities of the Shared SNAT and Custom Route If Both Are Configured for an ECS to Enable the ECS to Access the Internet?
- How Does an IPv6 Client on the Internet Access the ECS That Has an EIP Bound in a VPC?

Parent topic: FAQs