Re: [B.A.T.M.A.N.] IP from MAC

[Daniel Seither <post@tiwoc.de>]

Gustavo Lindberg schrieb:
> 2009/9/17 Daniel Seither <post@tiwoc.de>
> 
>> Gustavo Lindberg wrote:
>>> Then, At a meeting of 60 people there is the 99% probability  of the
>> least
>>> two men have a  birthday the same day. So,, Similarly to the case of
>>> MAC-Adress is:
>>>
>>> P(r)=1-65536!/(65536^r * (65536-r)!)
>> Robin uses 3 bytes of the MAC address to choose the IP address of the
>> mesh interface, not only 2 bytes = 65536 possibilities. This leads to
>> 2^24 = 16777216 different addresses.
>>
> 
> All IP addresses are derived by device's MAC address, if MAC is
> aa:bb:cc:dd:ee:ff then ath0 IP (mesh iface) will be 5.dd:ee:ff while ath1 IP
> and ath2 IP will be 101.ee:ff:1 and 102.ee:ff:1 (obviously in decimal
> format).

I read this before, but now I realize that colliding IP addresses of the
ath1/2 interfaces are a problem. This seriously limits the number of
nodes in the network for reasonably low collision probabilities. With
200 nodes, you already have a probability greater than 25%. Enter IPv6...

Regards,
Daniel