probably you would need to change what NIC you want to give "access to"
first of all, you need to maintain service console connection (take of this as "management"), which I assume it is still in vmnic0
you need to have a Internet Security Center , so why do not you connect vmnic1 to the WAN, create a second vSwitch with an uplink to the vmnic1, and connect your ISC to this!
if you need to give access to VMs on the LAN, create a portgroup in the first vSwitch (kind of creating a third vSwitch, but for virtual machines, on the same vSwitch of the Service Console Connection)
that way you could have the 3 connections, the service console which has to be there, the ISC connection , and if you need to the virtual machine on the same LAN as the service console
regards
Jose Ruelas
P.S. you could use VLANs too
Jose B Ruelas
http://aservir.wordpress.com