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IPv6 Address formate

KR SHAH
Level 1
Level 1

HI,

I read some document about IPv4 to IPv6 migration and In 6to4 translation, when IPv4 i.e. 192.168.99.1 is converted into IPv6, it shows IPv6 Address 2002:C0A8:6301::1/64. In this , the ::1 is what interface ID or else. and if interface ID then how interface id calculated.?

 

Thanks,

Kuntal

 

 

2 Replies 2

Michael Vincent
Level 1
Level 1

IPv6 addresses beginning with 2002::/16 are special '6to4' addresses (see:  http://en.wikipedia.org/wiki/6to4).

The 6to4 address is created by appending the hex version of the IPv4 address to the '6to4' prefix:

In your example:

2002:192.168.99.1::/64

2002:c0.a8.63.01::/64

2002:c0a8:6301::/64

The ::1 is simply the lower half 64-bits of the IPv6 address and can really be just about anything.  So it is indeed the "interface ID" but can be calculated from various means including statically assigned.

 

HI,

 

Thanks michael. But How to define interface ID. in some document i read that last bits are calcaulated from MAC addresses but i am still confuse about interface ID. Can you elaborate in detail ?

 

Thanks again for providing infromation,
 

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