then, How can we get hostname in first column?
I think, I nerver seen that host name in first colume?

Have a day.


> > Hi,
> >
> > When I issue "arp -a " , I can see as followings.
> >
> > ? (192.168.3.222) at 00:01:02:8D:93:80 [ether] on eth0
> > ? (222.112.196.68) at 00:D0:B7:B6:C0:31 [ether] on eth1
> > ? (222.112.196.69) at 00:02:55:AA:95:5E [ether] on eth1
> >
> > I'd like to know what does the "?" means at first column?
> >
> It means the IP addresses have no known hostname, or arp uses the -n
> option by default.
>
> --
> Fine's Corollary:
> Functionality breeds Contempt.