[clug-talk] IPCop Red interface ip address renewal

Gustin Johnson gustin at echostar.ca
Thu May 25 11:53:05 PDT 2006


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I have seen this before on low end NICs.  Factory shipped with the same MAC.

Mark Carlson wrote:
> On 5/25/06, Dave Watkins - CLUG <President at clug.ca> wrote:
>> Hmmmmmm…..
>>
>> If you can give me a valid reason why I would want to change the license
>> plate number on my car I'll tell you how to change your MAC address.
>>
>> I haven't thought of one.
> 
> I wrote this before, but it was slightly too off-topic until now.
> 
> I know this is not exactly about license plates, but here goes:
> 
> If someone else had the same license plate, you'd want to change yours
> so nobody confused the both of you. :-)
> 
> I know two people who have had duplicate MAC addresses cause
> hair-pulling-network-debugging-madness.  One, several years ago,
> bought some NICs off of eBAY from different locations (east and west
> coast USA, IIRC.)  When he plugged them in, they had the same MAC
> address and wouldn't work.
> 
> The other purchased >20 wireless APs locally and when he went to set
> up the network for one of his clients two of the APs wouldn't work
> properly... because they had the same MAC address.
> 
> So there you have it, not specifically a reason to change your license
> plate, but a very valid reason as to why MAC addresses are, and should
> be, changeable.
> 
> -Mark
> 
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