IPV6 CIDR notation

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Tags:
CIDR
IPv6
Subnet
I've found lots of info on IPV4 whilst IPV6 is scarce. Can you explain (simply) the IPV6 CIDR notation? i.i /48 /64 etc and how it is applied.

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Here’s a <a href=”http://digitalfreaks.org/~lavalamp/CIDR6.html”>chart that gives hosts and networks</a> in various IPv6 CIDRs. Check out this <a href=”http://technet.microsoft.com/en-us/library/bb726997.aspx#ECAA”>Microsoft Technet article on subnetting</a> also. This <a href=”http://www.2000trainers.com/tcpip/ipv6-subnetting/”>tutorial</a> might also shed some light on this topic.

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  • ITKE
    [...] IPV6 CIDR notation, asked via e-mail and answered [...]
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  • SilviaHagen
    Hi, I can see you already got an answer with some good links. In short I can add the following. The notation is working exactly the same as with IPv4, which means if you have a /48, that means the first 48 bits of the address are the set prefix. In this case this leaves you 16 bits for your own subnetting. The main difference between IPv4 and IPv6 is, that in IPv6 we don't do variable subnet masks anymore. An Interface ID is ALWAYS 64 bits, so the prefix for a host is always 64 bits (because the address has a total of 128 bits). You could theoretically change that rule and assign subnets beyond the 64 bit boundary. But this could create problems, as many process rely on the 64 bit interface ID (for instance stateless autoconfiguration). Hope this helps, Silvia
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