In the first part of NSX-T Distributed Firewall, I explained the importance of embracing NSX-T DFW. In this post, I review how you can create and apply firewall rules to implement Micro-segmentation. To create firewall rules, first you need to define a Policy section which basically contains one or more firewall rules. A policy in NSX-T DFW can be defined as stateful or stateless. In the case of being stateless, you need to define the rules in both directions. Otherwise, the reverse traffic is not allowed to pass. On the other hand, in the default stateful mode, when you define a rule it will apply bidirectionally.
Then you need to define the rules under the policy section which evaluates the criteria of a traffic flow. DFW rules determine whether the traffic should pass or get dropped based on the protocol and ports.
Continue reading “NSX-T Distributed Firewall – Part 2”
NSX-T Distributed Firewall (DFW) is one of the most comprehensive solutions to provide micro-segmentation from layer 4 to layer 7. It can monitor all the East-West traffic on your virtual machines and build a Zero-trust model. To leverage the DFW, vNIC of virtual machines need to connect to NSX-overlay segment, NSX VLAN backed segments or vDS port group supported from vSphere 7.0. The benefit of using DFW is that firewall rules apply at the vNIC level of virtual machines. In this way, traffic does not need to traverse to a physical firewall to get identified if the traffic can pass or drop, which is more efficient. This article will focus on using DFW to enforce L7 (FQDN/URLs) filtering.
You can give internet access to a VM or a user who login to a VM by Identity Based Firewall or even take one step further and control which specific URL/URLs are allowed to get accessed.
Continue reading “NSX-T FQDN/URL Filtering”