Saturday, September 19, 2009

IPv6 theory

The linked video introduces IPv6 theory. IPv6 is the 128-bit address replacement for IPv4. The Internet is expected to run out of it's 4-billion IPv4 addresses in 2012. IPv6 will replace IPv4 at the network-layer of the OSI stack. By replacing one layer in the stack, most applications and most layer-2 network devices will continue to function.

IPv6 includes several technical improvements over IPv4. IPv6 uses optional extension headers, so only packets requiring special options will have those headers. As a result most IPv6 packets will have simpler headers than their IPv4 counterparts. IPv6 eliminates broadcast, and instead uses multicast for most neighbor discovery functions. This is more efficient CPU-wise because hosts only need to subscribe to the multicast groups they require. IPv6 hosts use stateless autoconfiguration to acquire link-local and internet routable IPv6 addresses. In many cases this can eliminate the need for a separate DHCP server. And of course IPv6 includes 128-bit addresses, allowing 256 billion billion billion billion hosts.

The migration from IPv4 to IPv6 will be the highlight and most significant change of our networking careers. Most of us were not in this business during the IPv3 to IPv4 migration on January 1st 1983 (a 'flag day' migration). Odds are IPv6 will remain the dominant internet protocol until after we retire.

A PDF version of my presentation will be attached to the comments section.

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Blogger Darrell Root said...

PDF version of presentation at

September 19, 2009 at 11:11 PM  
Blogger Ecologu said...

Hi, please check the link for the video, it appears to be broken...Thanks.

September 21, 2009 at 5:03 AM  
Blogger Darrell Root said...

Thanks for the note. Link looks fixed now.

September 21, 2009 at 8:40 AM  
Blogger gizbri said...

Thanks Darrell for this and all your podcasts. I'm curious about IPv3, any links ?

September 22, 2009 at 9:20 AM  
OpenID o0hrtbrkr0o said...

Thanks Darrel, Been comming to this site for great info and learning, Would you mind if I use this power point as training material for people at beale afb in my squadron. I would appreciate it since this will be useful as a initial training to ipv6 for our troops.

October 12, 2009 at 2:55 PM  
Blogger Darrell Root said...

Feel free to use the presentation for training purposes. I posted it in the hopes that it would be useful (and as a former Army reservist, I'm particularly happy to have it useful to the US military).

I did leave out several important topics. Particularly DNS AAAA records, and under what circumstances an OS will choose to attempt IPv6 transport instead of IPv4 transport.

Regarding IPv3, there used to be a book called the "Arpanet protocol handbook". I can find references to it on the Internet, but have not found a link to an electronic copy.

October 12, 2009 at 8:07 PM  
Blogger ragmack said...

Thanks DR. I finally understand IPv6 way easier than IPv4.
Are you planing any icast on ISIS in the future?
I would love to get see one.

November 1, 2009 at 2:47 AM  
Blogger Darrell Root said...

I don't have operational experience with IS-IS, and IS-IS never really "clicked" based on my lab work. In addition my home routers don't support IS-IS. So I'm not planning any IS-IS videos.

If an IS-IS expert were to put together a good video, I'd be happy to post it to my podcast as a "guest presentation". There's nothing that says that all videos here have to be from me. If it's useful it's welcome.

March 20, 2010 at 10:25 PM  
Blogger scott said...

Darrell, Love your podcasts. I'm on my second push to pass the BSCI, and your podcasts help greatly. I can sit on the train to work, and soak-up your teachings. Anymore due?

March 31, 2010 at 3:12 AM  
Blogger Charles said...

Thanks for you video pod casts. I used the Cisco Packet tracer to do your labs and it worked just fine (and took up less room) in my home office.

I have just passed my CCNA (which I flamed out on the first try) and I attribute a lot of what I was able to accomplish were your various lectures.



April 30, 2010 at 11:22 AM  

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