The premiere source of truth powering network automation. Open and extensible, trusted by thousands.

NetBox is now available as a managed cloud solution! Stop worrying about your tooling and get back to building networks.

IPv6 cheat sheet

By stretch | Monday, July 7, 2008 at 5:28 a.m. UTC

IPv6 cheat sheet

New cheat sheet on IPv6 uploaded today. Preparing this sheet helped me become much more comfortable with IPv6, both as a protocol and as an addressing concept. The information was sourced from a number of texts, including the Cisco Press CCNP BSCI exam guide, Routing TCP/IP vol 1, 2nd ed, and a number of RFCs.

It's odd that, despite having been around for more than a decade, IPv6 has undergone a number of alterations from its original specification. Probably the most obvious example is that of site-local address space (FEC0::/10), which has recently (2004) been deprecated in favor of unique local addresses (FC00::/7). There have also been many IPv4-to-IPv6 adaptation mechanisms proposed, with varying levels of popularity.

If you haven't begun yet, I heavily suggest studying up on IPv6. It's a very intriguing protocol; its larger address space is probably the least interesting benefit offered. It's also on its way to your network.

Posted in Announcements


July 8, 2008 at 2:01 p.m. UTC

Very nice. Thanks for the website, really helpful.

Claus Holm Christensen
July 13, 2008 at 11:55 a.m. UTC

Already printed, looking good! Maybe you should note, that the 64 bit Interface ID in the address is the EUI-64 defined below? Another tip could be, that the 2000/3 scope covers all IPv6 addresses assigned. That's nice to know for firewalls.

July 23, 2008 at 1:55 p.m. UTC

Hi there,

please correct me if I am wrong, but there is an error in the section "EUI-64 Formation". If you flip the seventh bit from 0 to 1, the first hexa duple will be "02" and not "01", since 2^1 = 2. So the final address should read like "02 0a 27 ff fe 5c 88 19".

Thank you, G.

July 24, 2008 at 4:59 a.m. UTC

Whoops! You are indeed correct. I've uploaded a revised edition of the IPv6 cheat sheet (v1.1) with the EUI-64 section corrected. Nice catch!

Comments have closed for this article due to its age.