The easiest way to address the issue of how to monitor network traffic for specific VMs and gain network visibility is to use the port mirroring feature built into vSphere Distributed Switches (vDS). Gain network visibility with Hyper-V and Sflow Virtual port mirroring in a VMware virtual environment Gain network visibility with NetFlow in VMware You might find the other posts on this series useful: There are two main ways to do this in a VMware virtual environment depending on the types of virtual switches being used. In this post, we will be looking at how to get the full traffic from all the VMs in our example using VMware products, primarily VMware ESXI. Or is there? Full traffic capture on VMware ESXI There is no monitoring tool for this traffic, short of installing an agent on each VM. Also, if we used a TAP or a SPAN port on the physical switch to collect traffic from all connections A-D, we would still miss traffic going between virtual machines on the same host and in the same subnet (i.e. VM 1 communicating with VM 5) since that would just be passed through the switch using layer 2 switching. We would not have network visibility of the internal traffic inside the subnets (i.e. For instance, at point E in the network, we would only see traffic crossing between our two subnets because only traffic that has to cross the subnet boundary will be sent to the router for layer three routing. Let’s say that we want to get full network visibility into this environment from all access points.Īt each point marked in the physical network, we would only be able to see some of the traffic. In the above example, we have a simple network with eight virtual machines running in two different subnets connected to a virtual and physical network infrastructure. Security detection / Intrusion detectionįirst, in order to understand why the standard methods of collecting traffic for network visibility are not viable in a VMware virtual environment or a hybrid cloud, we need an example:.The reasons for capturing this traffic can be many and are not in the scope of this post, but some of the more common ones are: New network visibility tools and virtualization software are needed.Ĭonnecting a TAP to your network or using a SPAN port in order to capture network traffic is no longer possible in many cases. With modern data centers becoming more and more virtualized, and network virtualization and server virtualization becoming the norm, traditional methods of capturing east-west traffic in the data center have become increasingly limited. Grappling with how to monitor network traffic? You’re not alone.
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