Ingress
also: inbound traffic, incoming traffic
Network traffic flowing into a system or interface from external sources. The opposite of egress, which is traffic leaving the system.
Ingress refers to incoming network data—packets arriving at your system from outside. It's commonly used in networking contexts like firewalls, routing policies, and cloud infrastructure to describe rules that control what traffic is allowed in.
For example, an ingress firewall rule might allow incoming HTTP traffic on port 80, while blocking everything else. In Kubernetes, an Ingress resource is a specific object that manages external access to services running inside a cluster.
You'll see ingress mentioned alongside egress (outgoing traffic) when configuring security groups, network policies, or firewall rules. Understanding the distinction helps you properly restrict both inbound and outbound connections.