Each virtual machine represents a single computer within the network and resides on an ESX or ESXi server. In VMware, switches are used to establish a connection between the virtual network and the physical network. With ESX and ESXi, two different kinds of switches can be used: standard switches and distributed switches. Standard Switches To keep the traffic internally at the ESXi host the destination VM must be on the same vSwitch, but it could be located on another portgroup as the sender VM, as long as both portgroups has the same VLAN number configured. Oct 03, 2017 · Capturing Network Traffic on ESXi 5.5 using pktcap-uw ESXi 5.5 has a new CLI tool for capturing network traffic, which can be used instead of tcpdump-uw. The new tool, pckcap-uw, can capture traffic from uplinks, virtual ports, and vSwitches, unlike tcpdump-uw which allows you to only capture traffic from vmkernel interfaces.