arping - траблы...

Вот тут:
http://www.habets.pp.se/synscan/images.php?img=arping
у них пример команды как по маку узнать IP. Но у меня такое не проходит:

# arping -a 00:01:02:20:10:00
arping: invalid option -- a
Usage: arping [-fqbDUAV] [-c count] [-w timeout] [-I device] [-s source] destination
-f : quit on first reply
-q : be quiet
-b : keep broadcasting, don't go unicast
-D : duplicate address detection mode
-U : Unsolicited ARP mode, update your neighbours
-A : ARP answer mode, update your neighbours
-V : print version and exit
-c count : how many packets to send
-w timeout : how long to wait for a reply
-I device : which ethernet device to use (eth0)
-s source : source ip address
destination : ask for what ip address

Действительно там такой опции нет, делаем:

# arping 00:01:02:20:10:00
arping: unknown host 00:01:02:20:10:00

Как быть??? Хост с таким маком есть.