Okay, my snv 73 box is now a snv 85 box. Everything is working except for my punchin, but only because I need to bypass my Sun Ray 1G (and the Sun Ray Server 4.0 was dead easy to install). But the vnic_setup.sh script is still not working:

# ./vnic_setup.sh 0:1:4a:f2:31:34
Invalid link name: LINK
# LD_LIBRARY_PATH=/opt/VirtualBox:/opt/VirtualBox/qtgcc/lib:. ; export LD_LIBRARY_PATH
# ./vnic_setup.sh 0:1:4a:f2:31:34
Invalid link name: LINK
# ./vnic_setup.sh 0:1:4a:f2:31:34 vnic1
vnic1
# ifconfig -a
lo0: flags=2001000849 mtu 8232 index 1
	inet 127.0.0.1 netmask ff000000 
bge0: flags=201000843 mtu 1500 index 2
	inet 192.168.2.130 netmask ffffff00 broadcast 192.168.2.255
	ether 0:a:e4:34:2f:da 
lo0: flags=2002000849 mtu 8252 index 1
	inet6 ::1/128 

Well the VirtualBox manual tells me how to do it manually:

# /usr/lib/vna bge0 0:1:4a:f2:31:34
vnic0
# ifconfig vnic0 plumb
# ifconfig -a 
lo0: flags=2001000849 mtu 8232 index 1
	inet 127.0.0.1 netmask ff000000 
bge0: flags=201000843 mtu 1500 index 2
	inet 192.168.2.130 netmask ffffff00 broadcast 192.168.2.255
	ether 0:a:e4:34:2f:da 
vnic0: flags=201000842 mtu 1500 index 3
	inet 0.0.0.0 netmask 0 
	ether 0:1:4a:f2:31:34 
lo0: flags=2002000849 mtu 8252 index 1
	inet6 ::1/128 
#  /usr/lib/vna bge0 0:1:4a:f2:31:36
vnic1
# /usr/lib/vna bge0 0:1:4a:f2:31:38
vnic2
# ifconfig vnic1 plumb
# ifconfig vnic2 plumb
# ifconfig vnic0 192.168.2.150 destination 192.168.2.160 netmask 255.255.255.0 up
# ifconfig vnic1 192.168.2.151 destination 192.168.2.161  netmask 255.255.255.0 up
# ifconfig vnic2 192.168.2.152 destination 192.168.2.162 netmask 255.255.255.0 up
# ifconfig -a
lo0: flags=2001000849 mtu 8232 index 1
	inet 127.0.0.1 netmask ff000000 
bge0: flags=201000843 mtu 1500 index 2
	inet 192.168.2.130 netmask ffffff00 broadcast 192.168.2.255
	ether 0:a:e4:34:2f:da 
vnic0: flags=201000851 mtu 1500 index 3
	inet 192.168.2.150 --> 192.168.2.160 netmask ffffff00 
	ether 0:1:4a:f2:31:34 
vnic1: flags=201000851 mtu 1500 index 4
	inet 192.168.2.151 --> 192.168.2.161 netmask ffffff00 
	ether 0:1:4a:f2:31:36 
vnic2: flags=201000851 mtu 1500 index 5
	inet 192.168.2.152 --> 192.168.2.162 netmask ffffff00 
	ether 0:1:4a:f2:31:38 
lo0: flags=2002000849 mtu 8252 index 1
	inet6 ::1/128 

And when the system comes up, it has an IP of 192.168.2.29. And I can't ping any of the 3.

It looks like I need to learn the CLI for VirtualBox. Here is a related article: Internal network does not work for OpenSolaris guests