[CentOS] so many arp caches why?

thus nate spake:
> 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

Proxy ARP enabled?

Timo