On March 12th VMware released ESXi 6. 0 and I explained in another post how to get Realtek and Marvell NICs to work with it.
Unfortunately it is not as easy as with ESXi 5. 0 VMware " blacklisted" the drivers of ESXi 5. 1, so you need to use net55- r8168 for Realtek 8168 chips and/ or my " replacement" packages net51- r8169 and net51- sky2 instead.