Techniques for delivering a distributed network security service providing isolation of customer data are described. One example method includes assigning a first node in a distributed network to a first customer; assigning a second node in the distributed network to a second customer; configuring the assigned first node to process network traffic only from the first customer; configuring the assigned second node to process network traffic only from the second customer; processing, by the assigned first node, network traffic associated with the first customer; and processing, by the assigned second node, network traffic associated with the second customer, wherein the network traffic of the first customer is isolated from the network traffic of the second customer, wherein the network traffic of the customers is kept isolated from one another.