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.

About the Author

Jeremy Stretch is a network engineer living in the Raleigh-Durham, North Carolina area. He is known for his blog and cheat sheets here at Packet Life. You can reach him by email or follow him on Twitter.

Posted in Announcements


Michael (guest)
July 8, 2008 at 2:01 p.m. UTC

Very nice. Thanks for the website, really helpful.

Claus Holm Christensen (guest)
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.

Guillaume (guest)
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!

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