I got intrigued when reading Nicira’s white paper claiming their Open vSwitch can run within vSphere/ESX hypervisor. There are three APIs that you could use to get that job done: dvFilter API (intercepting VM NIC like vCDNI does), the API used by Cisco’s Nexus 1000V, or the device driver interface (intercepting uplink traffic). Turns out Nicira decided to use a fourth approach using nothing but publicly-available APIs.
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