ok, would re1 be my virtual interface?
root@monitoring01:~ # ifconfig
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
ether 00:0c:29:d1:a2:fb
inet 10.150.1.90 netmask 0xffffff00...