Networking
Subnet
Quick answer
A subnet is a segment of a virtual network's IP address range, typically classified as public or private.
A subnet is a segment of a virtual network's IP address range, typically classified as public or private.
Why it matters
Runners belong in private subnets. Anything in a public subnet with an internet gateway is reachable from outside, which a machine executing pull-request code should never be.
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Related
NAT gatewayA NAT gateway lets instances in a private subnet reach the internet without being reachable from it.Security groupA security group is a stateful virtual firewall controlling inbound and outbound traffic for cloud instances.VPCA VPC is an isolated virtual network within a cloud provider, with its own address space and routing.