[lwip-users] [lwip] Deploying Ethernet MAC addresses

[leon . woestenberg]

Hello Adam and others,

if you plan on deploying Ethernet interfaces in the real
world (i.e. outside your test environment), using a
unique MAC address is a must. See
     http://standards.ieee.org/regauth/oui/tutorials/
and for our (Ethernet) purpose, specifically:
     http://standards.ieee.org/regauth/oui/tutorials/lanman.html

This is where the list of OUI (organizational unique id) are:
     http://standards.ieee.org/regauth/oui/index.shtml

I'm not aware of a public OUI or MAC address is available for
testing. Even 00-00-00 is already given away (to Xerox).

I believe requesting a OUI range is free (or maybe needs
IEEE membership?), but it requires you to administer
every given MAC you put in the real world, AFAIK.

The links above should give all the details. Regards,

Leon.



                                                                                
                                    
                    Adam Dunkels                                                
                                    
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                    address@hidden       Subject:     Re: [lwip] Ethernet MAC 
address now 3 x u16_t?                
                    s.se                                                        
                                    
                                                                                
                                    
                                                                                
                                    
                    17-12-01 15:00                                              
                                    
                    Please respond                                              
                                    
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Hi Leon!

On Monday 17 December 2001 11.55, you wrote:
> what's the rational for changing the MAC address struct to
> u16_t?

The only reason was that I was testing out the 16-bit char stuff that was
discussed here a while ago. Also, 16-bit accesses are a bit faster than
8-bit
on most CPUs (or am I wrong here?).

> I think six "u18_t" are the obvious choice, given that:
> - a MAC address is defined to be 6 octects
> - is split in two halves of six u16_t
>   (of which three organization unique octets)

You definately have a point here. So you recommend going over to u8_t
again?

By the way, aren't there some kind of private MAC-addresses? I guess such
an
address should be the "default" address in the lwIP distribution files.

> BTW, the cs8900a driver is ready to be released RSN,
> lwIP 0.5 compatible and tested (somewhat).

Great!

/adam
--
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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