[wplug] Clearing arp cache

[Brian Sammon]

> It's completely possible, looking at the arp.c sources from FreeBSD and
> net-tools (Linux), to make arp -d -a work in Linux.  However I suspect
> the real reason it hasn't been implemented in net-tools' arp is because
> there is another command to flush the arp cache:
> 
> 	ip neigh flush all

What package is the "ip" command in?  I don't seem to have it on my computer.