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IP range selection
Routing table
Subnet access control list
Summary
Subnets are created from VPC address prefixes and are bound to a single zone in one region; customers can have multiple subnets per address prefix.
Each subnet in a VPC can reach other subnets through private layer 3 routing through the implicit router. The implicit router is the inherent network connectivity between all the subnets that are created within a VPC. A VPC, like a subnet, is also deployed and bound to only one region. Within that region, a VPC can span multiple zones, however, subnets are bound to a single zone and do not span multiple zones.
Features
Private connectivity
Subnets within the VPC offer private connectivity, they can talk to each other over a private link through the implicit router. Setting up routes is not necessary.
Public connectivity
Subnets in your VPC can connect to the public internet through an optional public gateway. You can assign floating IP addresses to any virtual server instance to enable it to be reachable from the internet, independent of whether its subnet is attached to a public gateway.
IP range selection
The most efficient location for your IP range (CIDR block) is automatically calculated to maximize your available IP addresses. You can also customize the IP range by selecting a different address prefix, changing the number of addresses, or by entering your IP range manually.
Route tables
IBM Cloud VPC automatically generates a default routing table for the VPC to manage traffic in the zone. By default, this routing table is empty. You can add routes to the default routing table, or create a custom routing table, and then add routes to the new table.
Subnet access control list
Access control lists (ACLs) can be used to control all incoming and outgoing traffic in IBM Cloud VPC.
Public gateway
Attaching a public gateway allows all attached resources to communicate with the public internet.
Summary
- 1Subnetprovided