I try and look to logs of ESXi and here is " Loading VMkernel module 'dvfilter' " and dvfilter loaded succesfully
dvfilter is VMware's internal working name for the vNetwork Appliance API, which is exposed in vSphere 4 primarily for network security (firewalls, IDS/IPS) through the VMsafe program. You can see a mention of vNetwork Appliance API in a blog post here from one of our networking managers:
Apparently the internal name is what ended up showing in the licensing configuration, but that's what it is.
Being licensed for this item enables you to use a VMsafe-enabled network security product when they later ship from Check Point, IBM ISS, Altor Networks, Reflex Systems, Third Brigade, etc. in your vSphere 4 deployment.
VMware Product Management
Which ESXi license is needed for me to have dvfilter and serialuri features enabled?
Also, does it matter what vCenter server license I have?