East-west traffic is network communication that flows between internal systems, workloads, or devices rather than in and out of the environment. It matters because internal traffic is where attackers often expand access after initial compromise.
What is East-West Traffic?
East-west communication includes server-to-server, workload-to-workload, and internal application traffic. It is a key focus for segmentation, anomaly detection, and zero-trust efforts because compromise often spreads through these paths.
What East-West Traffic Commonly Supports
Common uses include segmentation strategy, internal traffic visibility, lateral-movement defense, and workload policy design.
East-West Traffic vs. North-South Traffic
East-west traffic stays mostly inside the environment between systems. North-south traffic moves in or out across broader network boundaries.
Frequently Asked Questions
Why is east-west traffic important?
Because once attackers are inside, this is often the traffic they abuse to move, discover, and expand.
Does east-west always mean data center only?
No. The concept also applies in cloud, campus, branch, and hybrid networks.
