[wplug] Weird ARP Problem...

Carl Benedict cbenedic at pittsburghtechs.com
Mon Sep 8 03:39:03 EDT 2003


Mike,

   Sounds interesting.  

1.)  Did you check the ARP table on the Win2k machine when this behavior
occurred?  If so, did the gateway have the hosts Mac->IP entry?

2.)  What OS was the 2nd gateway running that you put between the two? 
Or are you saying that you switched gateways to test?

3.)  Are you running Internet Connection Sharing on the Win2k box?  

The first thing that comes to mind is that the Win2k box is losing the
ARP entry for your system, and prehaps not sending an ARP reply for some
reason.  How about IP conflict?  Does your new system conflict with any
other systems on the network?

- Carl

On Thu, 2003-09-04 at 10:30, mike wrote:
> I'm having a weird problem with a RedHat 9 box that I just setup.  After
> awhile the NIC stops responding.  I can bring it back to life by
> stopping and starting the network service.  
> 
> At first we thought it may be a IRQ conflict or APMD problem, but after
> ruling that out and playing around with ethereal I discover its an ARP
> problem.   I do an arp -n, and it shows the hardware address of my
> gateway as incomplete.  
> 
> I tried manually adding the gateways entry into the table and it shows
> as permanant but after a bit, it loses it again and starts its mini
> broadcast storm.  Who has 192.168.0.1, tell blah blah blah..  But it
> never gets a response from the gateway.  
> 
> My gateway is a win2k server running NAT.  I tested this by subnetting
> my LAN and putting the redhat machine behind another gateway, and it
> worked fine..
> 
> I don't know if my server isn't understanding the ARP broadcast or what,
> but why does it still not work when I manually specify the ARP entry?
> 
> Gracias
> 
> -Mike
> 





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