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GoOn (programming.dev)
submitted 2 years ago by to c/programmer_humor@programming.dev
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[–] 177 points 2 years ago (2 children)

0.0.0.0/0 0::0/0

You didn't specify it couldn't be in CIDR block notation...

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  • [–] 7 points 2 years ago (1 child)

    Remember, when we abbreviate an ipv6 address all leading zeros are reduced to a single 0.

    E.g

    0003 would just become 03

    When there are geoups of 4 zeros these can be represented as a single 0 or as a double colon ::

    But we can only use the :: once so when summarizing an address containing multiple groups of 4 0s one after the other they can all be abbreviated to a single ::

    Eg

    fe80:0000:0000:0000:0210:5aff:feaa:20a2 would become fe80::210:5aff:feaa:20a2

    Therefore it is perfectly valid to abbreviate an address of 0000:0000:0000:0000:0000:0000:0000:0000 /0 to just ::/0

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