zero suppression vs compression in addresses
bjorn at mork.no
Mon May 18 12:44:24 CEST 2009
<michael.dillon at bt.com> writes:
> So, this draft *DOES* change what is considered to be
> a syntactically correct when it allows "::" to be used
That's clearly not the intent. For reference, quoting from the
beginning of section 4:
"A recommendation for a canonical text representation format of IPv6
addresses is presented in this section. The recommendation in this
document is one that, complies fully with [RFC4291], is implemented
by various operating systems, and is human friendly. "
> Admittedly, section 4.2.3 is not very clear and it may not survive
> future discussion,
I guess it should not survive, given your interpretation of it.
The point of section 4.2.3, as I read it, is: If there are more than one
sequence of 16 bit groups of zeroes, compress the longest. In case of a
tie, compress the first sequence.
2001:db8:0:0:0:1:0:0 => 2001:db8::1:0:0 (longest match win)
2001:db8:0:0:1:0:0:0 => 2001:db8:0:0:1:: (longest match win)
2001:db8:0:0:1:0:0:1 => 2001:db8::1:0:0:1 (first of equal length win)
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