We talk about network traffic in two ways – North/South traffic is the traffic heading in and out of your network. East/West traffic is the traffic from one server to another inside your network. So why do we focus so much on North/South and almost forget about East/West?
As I mentioned in Identity and Security Starts at Home, the era of Zero Trust means we can’t trust traffic coming from inside the house. Internal systems can be compromised and if your internal security is just IP whitelisting or trusted certs, a “trusted app” can do a lot of damage by probing the internal network.