link-local-address

Link Local Address


link-local-address

You can now manage on your IPv6 addresses. But, you will wonder, why is that their is more than one IP address found with just only one device? The answer is simple. It is put there for you to read this article.

Link Local Address always starts with FE80  :  :  … : …  .  :  ..  :  As you enable your router, this address is generated directly as one of your addresses. Now, how does the router know about your address? How was it generated?

Remember with your MAC Address? This is the one used to generate a Link Local Address. Check this:

Host A for example has a 0000.1111.1111 for its MAC Address.

First thing to do is cut that address in half. So, it becomes 0000.11 \ 11.1111..

Next, insert characters in the middle… Constantly, those characters are FFFE

The output would be: 0000.11FF.FE11.1111

then, if we are going to elaborate the binary equivalence for the above item is:

0000  0000  0000  0000  . 0001  0001  1111  1111  .  1111  1110  0001  0001. 0001  0001  0001  0001

you will count from the very left from 1 to 7… Then flip the seventh one.. example..:

0000  0010  0000  0000  . 0001  0001  1111  1111  .  1111  1110  0001  0001. 0001  0001  0001  0001

then,.. convert again back to hexadecimal like this:

0200.11FF.FE11.1111 . Omit unused zero. The output then become this with the correct separator for IPv6.

200:11FF:FE11:1111

The result is what we called Link Local Address.

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9 thoughts on “Link Local Address”

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