zero suppression vs compression in addresses

Daniel Roesen dr at
Fri May 15 14:30:18 CEST 2009

On Thu, May 14, 2009 at 03:44:27PM -0700, Alan Batie wrote:
> I think I may have misinterpreted how zero compression and suppression
> work:  when I say 2607:f678:1::0/60, I expect the "::" to mean "all 0's
> from the preceding digit to the next", but from what I'm seeing
> configuring things, (leading) zero *suppression* seems to be happening
> at the same time within word (32 bit) boundaries, which colons always
> delineate, making that really 2607:f678:0001::0/60.  Thus what I really
> wanted to say was 2607:f678:1000::0/60.

Correct. The double-colon form replaces 1-n 32-bit "words" of zeros.

Best regards,

CLUE-RIPE -- Jabber: dr at -- dr at IRCnet -- PGP: 0xA85C8AA0

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