Programmer Humor

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submitted 11 months ago by mac to c/programmer_humor

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[–] [email protected] 177 points 11 months ago (2 children)

0.0.0.0/0 0::0/0

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

[–] [email protected] 27 points 11 months ago

::/0

[–] [email protected] 7 points 11 months ago (1 children)

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 ::

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

[–] [email protected] 2 points 11 months ago

Eh, I've seen some software internally prefer 0::0 instead of just ::0 or :: . Notation wise though you are correct, it is unnecessary.