[CentOS] so many arp caches why?

MontyRee wrote:
>
>
> Hello, all.
>
>
> When I execute arp -a -n, there are lots of arp caches like below.
> Surely, I set netmask and Broadcast without problem and routing table also
> no problem.
>
> System is CentOS release 4.7 i386.
>
> I know how to delete the arp cache,
> but I don't know why ..

run tcpdump on the interface, to see what is happening on it.
nate