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From: Control Freq on 9 May 2008 01:16

Well, I fixed the problem. I don't often get to respond to my own
questions.

The problem was caused by a corrupt ARP cache. I write down the MAC
and IP addresses shown using 'arp -a'.
After exactly ten minutes the OS will refresh the list.

I do an 'arp -a' again and notice that some of the MAC addresses are
appearing in the list twice! to different IP addresses.
I don't know what is causing this. But, adding static ARP entries
using 'arp -s ....' fixes the problem for me. Fortunately, my network
uses static IP addresses so this is an easy and permanaent fix.

But, the question still remains about what is causing the ARP cache
corruption?

Regards
From: Charliec on 10 May 2008 18:24
I having a bit of the same problem - the ping has stop working between
my desktop and laptop which are on a home network 4-Port Router
(desktop has WinXP and laptop has Vista). I share the desktop's "E"
drive with the laptop. As of a few days ago, the two pcs are not
seeing each other on the network.

What is the ARP cache and how does one access it?

Thanks

>On Thu, 8 May 2008 22:16:20 -0700 (PDT), Control Freq <nick(a)nhthomas.freeserve.co.uk> wrote:

>
>Well, I fixed the problem. I don't often get to respond to my own
>questions.
>
>The problem was caused by a corrupt ARP cache. I write down the MAC
>and IP addresses shown using 'arp -a'.
>After exactly ten minutes the OS will refresh the list.
>
>I do an 'arp -a' again and notice that some of the MAC addresses are
>appearing in the list twice! to different IP addresses.
>I don't know what is causing this. But, adding static ARP entries
>using 'arp -s ....' fixes the problem for me. Fortunately, my network
>uses static IP addresses so this is an easy and permanaent fix.
>
>But, the question still remains about what is causing the ARP cache
>corruption?
>
>Regards
******************************************************
Charliec
From: Control Freq on 12 May 2008 16:33

Hi,

The ARP cache (Address Resolution Protocol) is a list of IP addresses
and matching MAC addresses. Each network device has a MAC address. The
MAC address is fixed, and should be unique in the world. The IP
address is assigned, either statically, or dynamically by a local DHCP
server.

So, each computer on a network keeps an ARP cache.

You can use the 'arp' command from a windows command prompt. Just type
'arp -a' (without the quotes) to see the current list.

The is plenty of help on google about this.


Best of luck.
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