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Making the transition from IPv4 to IPv6.....

20 replies to this topic

#16 OP metro2012

metro2012

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Posted 24 July 2012 - 10:19

Trillions? You need to check the math again

A /64, which is what is planned to give to each lan or vlan - so pretty much your ISP will give each user a /64 - your talking about 2^64 or 18,446,744,073,709,551,616 addresses for your home..

the total address space for ipv6 is 2^128 or 3.4028236692093846346337460743177e+38

Dude its HUGE amount of space - no there is no plans for NAT to be needed.

Here read this for some examples of how big the address space is
http://www.tcpipguid...ressSpace-2.htm

• The earth is about 4.5 billion years old. If we had been assigning IPv6 addresses at a rate of 1 billion per second since the earth was formed, we would have by now used up less than one trillionth of the address space.
• The earth's surface area is about 510 trillion square meters. If a typical computer has a footprint of about a tenth of a square meter, we would have to stack computers 10 billion high blanketing the entire surface of the earth to use up that same trillionth of the address space.

Here are a couple more analogies of the size difference in ipv4 vs ipv6

So, ball park, if all the IPv4 space would fit in an iPod, then all the IPv6 space is the size of the entire Earth.

"if the earth were made entirely out of 1 cubic millimetre grains of sand, then you could give a unique [IPv6] address to each grain in 300 million planets the size of the earth"

this may be stupid what i am about to say but bare with me........

(ill use ipv4 addressing so i dont have to write aa:22:bb etc etc....)

if my ISP assigns me 198.234.111.234/255.255.255.0 i could use, 198.234.111.999, 198.234.111.1000,198.234.111.1001,198.234.111.1002, etc, for all my PCs in my network? (i want to say again that yes i know that the max number is 255 in ipv4, but i wanted to put a example that shows the posibility and what you are telling me about ipv6).

once i get the details from my isp, how do i set it up to work in dual stack mode in ddwrt?

#17 +BudMan

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Posted 24 July 2012 - 13:38

" how do i set it up to work in dual stack mode in ddwrt? "

And how is your isp rolling out ipv6, maybe they are currently not even supporting a dual stack/native method? Maybe they are using 6rd? You are going to need to contact your isp on how they are rolling out ivp6.

I would assume dhcpv6-pd, but you never know - problem is I don't believe dd-wrt currently support it. You would have to move to openwrt for dhcpv6-pd support, etc.

#18 Roger H.

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Posted 24 July 2012 - 15:43

Tomato Toastman builds supported DHCPv6-PD also (well in that i see it as an option, no native IPv6 here - Cablevision).

Here&amp;#39;s what an IPv6 address looks like and the way the router is shown as well:

(Took those from Broadband Reports forums).

Anyways, your router would be assigned a block of addresses, as was said a /64 which is more addresses than the ENTIRE IPv4 network currently can carry. So then you can put 4 BILLION devices and more on your network if you so want to. LOL.

So from the screenshot, Comcast assigned 2601:000c:1b80:/64 to that user so then they can use any combination of that after for other devices on the network.

The Fe80:/8 addresses are similar to the 192.168.x address we have now. Those are all internal/local.

#19 OP metro2012

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Posted 25 July 2012 - 08:48

And how is your isp rolling out ipv6, maybe they are currently not even supporting a dual stack/native method?

I didnt ask that much. I just ask if they supported ipv6 Sucks if they dont support dual/native....

I would assume dhcpv6-pd, but you never know - problem is I don't believe dd-wrt currently support it. You would have to move to openwrt for dhcpv6-pd support, etc.

in what sense it isnt supported in ddwrt?

#20 OP metro2012

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Posted 25 July 2012 - 08:55

it seems the block my isp has (reading around the net) is 2a02:9000::/23

#21 +BudMan

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Posted 25 July 2012 - 11:51