IPv4 v IPv6

[mick crane <mick.crane@gmail.com>]

hello,
I know nothing about IPv6.
Can somebody point to a good explanation ?
Without knowing anything about it I'm wondering if I should request an 
IPv6 range from my ISP to use locally.
A network card have IPv4 and IPv6 addresses that are different, not the 
same address in different notation ?
Then with firewalling do you need to specify both IPv4 and IPv6 ranges ?

mick

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