Why Traffic Can't Be Forwarded from a VPC with a Route Destination of 0.0.0.0/0 to Its Enterprise Router?

Scenarios

Traffic cannot be forwarded from a VPC to the enterprise router that it is attached to if you set the destination of a route in the VPC route table to 0.0.0.0/0 and:
  • An ECS in the VPC has an EIP bound.

    Refer to solution 1.

  • The VPC is being used by ELB, NAT Gateway, VPC Endpoint, or DCS.

    Refer to solution 1 or solution 2.

Solutions

Select a solution based on your actual service scenario.
  • Solution 1: Change the destination (0.0.0.0/0) of the default route to a specific IP address range, for example, 192.168.0.0/16.
  • Solution 2: Add eight routes with specific IP address ranges as the destination to replace the default route (with a destination of 0.0.0.0/0).
    Table 1 Route destinations and next hops

    Destination

    Next Hop

    128.0.0.0/1

    Enterprise router

    64.0.0.0/2

    Enterprise router

    32.0.0.0/3

    Enterprise router

    16.0.0.0/4

    Enterprise router

    8.0.0.0/5

    Enterprise router

    4.0.0.0/6

    Enterprise router

    2.0.0.0/7

    Enterprise router

    1.0.0.0/8

    Enterprise router
Parent topic: FAQ