Not sure how well known this trick is, but it is possible to figure out the vendor of a particular NIC by looking at the first few digits of the MAC address. We used to use this when I worked at Sun to figure out if the customers were using pukka Sun NICs...
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Map MAC to NIC vendor.
Adding a second IP address to a NIC in data ONTAP
filer*> ifconfig e1b alias 192.168.101.4
Will add the address 192.168.101.4 to my NIC e1b, which already contained the IP 192.168.100.4
filer*> ifconfig e1b
e1b: flags=0x3d48867 mtu 9000
inet 192.168.100.4 netmask 0xffffff00 broadcast 192.168.100.255
inet 192.168.101.4 netmask 0xffffff00 broadcast 192.168.101.255
...
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