An IPv6 address can be very long as it is a 128 bits one. Asking someone verbally to check the connectivity to a given address can be tricky :-)
There are however some rules to shorten it and it’s a way to remove zeros.
Rule 1: Suppress leading zeros
Remove all leading zeros, the left side zeros, in every 16 bits field.
For example:
2001:0db8:0000:0000:0000:0000:000:0001
will be simplified to
2001:db8:0:0:0:0:0:1
Of course 0000 becomes 0.
Rules 2: The larger sequence of :0:0: can be reduced to ::
You can compact a sequence of zeros to the symbol ::.
Applying the rule to 2001:db8:0:0:0:0:0:1 would get us 2001:db8::1.
- You can’t compact just one
:0:– only a sequence. - If there is more than one sequence of
:0:you can only compact the large one. If they have the same length compact the first one.
2001:db8::1:1:1:1:1 is not correct. It must be 2001:db8:0:1:1:1:1:1.
2001:0:0:1:0:0:0:1 will become 2001:0:0:1::1.
2001:db8:0:0:1:0:0:1 will become 2001:db8::1:0:0:1.
That’s it.
