Assigning multiple IP's on a single NIC
# ifconfig hme0:1 plumb
# ifconfig hme0:1 123.123.123.124 netmask 255.255.255.0 up
# ifconfig -a
to check.
/etc/hosts
127.0.0.1 localhost 123.123.123.123 serverA loghost 123.123.123.124 serverB
/etc/hostname.hme0:1
ServerB