network problem

[Teddy Mills]

Was a mac hw address tied to a NIC in /etc/udev/netpersistent rules?



JoeHill wrote:
> James Knott wrote: 
>
>   
>> Thomas Milne wrote:
>>     
>>> On Wed, Apr 8, 2009 at 1:16 AM, Jamon Camisso <jamon.camisso-H217xnMUJC0sA/PxXw9srA at public.gmane.org>
>>> wrote: 
>>>       
>>>> So I've run into a really strange network problem. Box X had IP Y. IP Y was
>>>> moved to box Z. Box X and Z are behind the same switch, and use the same
>>>> gateway. The switch is a 3Com 4400.
>>>>
>>>> The IP is accessible by any host behind the switch. But it only routes
>>>> properly when on box X. Box Z, no luck. I've tested iptables on box Z, and
>>>> disabled it just to be sure, no luck. Box Z also works with all the other
>>>> IPs it has assigned to it, that are on the same subnet as IP Y.
>>>>
>>>> I'm thinking it is an arp cache on the switch or router, but don't have
>>>> access to either to check. You can see where I'm going, how can I get box Z
>>>> to be accessible? Arp?
>>>>
>>>>       
>>>>         
>>> Don't just move the IP from X to Z, move the network card as well.
>>>     
>>>       
>> Why should it be necessary to move the NIC?  I've often moved IP
>> addresses, without changing cards.
>>     
>
> I would hope so! I certainly don't replace a NIC every time I change IP's.
>
>   
>> And, with lots of equipment, there's
>> no card to move.  Also, the contents of an arp cache are temporay. . 
>>     
>
> They're _supposed_ to be temporary, yes. However, try a search on 'arp cache
> won't clear'. Admittedly, most of the results seem to be Windows related...
>
>   
>> They should clear out automagically after a few minutes.  A reboot would
>> certainly flush any cache entries.
>>     
>
> Yes, if he could reboot the machine with the arp cache. Jamon said he could not
> access the router or switch.
>
>   


-- 


--------------------------------------
Teddy David Mills
TMIS Linux System Administrator

E: teddy-5sHjOODPK7E at public.gmane.org
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