Talk:IPv6 address

Final Stages

Okay, I think I've finished my editing of the page. Things that remain to be done:

• write a short (two or three paragraphs) summary to include in the Addressing section of the IPv6 page;
• write a structure section, about addresses being 128 bits, host numbers and stuff;
• rewrite the introduction completely, remove anything that went into the Structure section, remove all the silly "my address space is larger than your address space" stuff written by people who don't understand logarithms.--Jec (talk) 21:51, 2 November 2009 (UTC)

Thanks for your input, Jec. Please elaborate on how to change the introduction into a structure section and your comment on 'logarithms'. IPv6 address space is larger (and for good reason) than IPv4 address space and should be at least mentioned in some form or other. Please indicate your view on how to introduce the 'larger address space' without becoming silly. —— _D^an_d^or ⁱ_D (talk) 14:11, 3 November 2009 (UTC)

Wrote an introduction on IPv6 about this page and removed several sections that are hereby moved to this page.

Added a [[Category:IPv6]] at the bottom of the page. Probably more catagories are needed there.

> Please elaborate on how to change the introduction into a structure section

The introduction mixes up stuff that belongs in the introduction with stuff that is about the structure of IPv6 addresses (64-bit prefix and stuff). This needs to be split.

> Please indicate your view on how to introduce the 'larger address space' without becoming silly.

Claims such that IPv6 provides 17 gogozillions addresses per square furlong of the surface of the principality of San Marino are silly. They tell you absolutely nothing.

Try to keep it technical and to the point: with IPv6, the system manager has between 64 and 96 bits of address space to play with. This allows defining a convenient and efficient addressing hierarchy without being constrained by the size of addresses. (In other words, what is meaningful is the number of bits, not the number of addresses -- i.e. the logarithm of the number of addresses). --Jec (talk) 00:03, 15 November 2009 (UTC)

Moved the content around: from intro to IPv6 Address Space and to the Structure section. Also moved last subsection to the Notation section. When I reread it it appeared to be just a way of circumventing a naming clash with UNC paths. A DNS domain was registered by Microsoft, but no actual queries are made, so it is just a different way of writing an IPv6 address.

I hope you like it. —— _D^an_d^or ⁱ_D (talk) 21:13, 15 November 2009 (UTC)

There is something wrong with this:

Local addresses: ::1/128 — the loopback address is a unicast localhost address (analogous to the RFC.

but I'm not sure what was intended. 206.171.6.11 (talk) 16:15, 26 November 2009 (UTC)

Top Templates

Added some templates at the top of this page. —— _D^an_d^or ⁱ_D (talk) 18:37, 14 November 2009 (UTC)

Address Types: edits reverted

The edits by User:140.124.25.86 and User:12.237.205.131 are hereby reverted, since they are wrong (anycast), have sloppy format (multicast), or incomplete (unicast). Furthermore, they distract the reader from the subject of the section. I like the way of representing an IPv6 address this way though (in a more nuts-and-bolts fashion), but this should be done in the structure section in more general terms. —— _D^an_d^or ⁱ_D (talk) 16:31, 26 December 2009 (UTC)

Ambiguity in address compression

It isn't clear in the article if a double colon can represent just one group of all zeros or if it must represent at least two. The problem is that RFC 5321 states the latter, whereas RFC 4291 states the former. Could anyone shed light on this, and edit the article accordingly? —Preceding unsigned comment added by 94.195.110.161 (talk) 07:24, 17 August 2010 (UTC)

There is no ambiguity. Both versions of the RFC are equally clear on this. But this article is wrong and poorly written. Thank you for your observation.Kbrose (talk) 17:46, 17 August 2010 (UTC)

Ambigue or not, RFC 5952 clarifies this and says that at least two groups of zeroes can be eligible for double colon representation, not one. This is changed in the article now. —— _D^an_d^or ⁱ_D (talk) 21:04, 19 February 2011 (UTC)

There is no ambiguity. RFC5952 tells how programs should write IPv6 addresses. RFC4291 tells how programs should read IPv6 addresses. More specifically the RFC 4291 tells: 'The use of "::" indicates one or more groups of 16 bits of zeros'. So, an IPv6 address using :: to substitute ONLY one group is VALID. —Preceding unsigned comment added by 89.96.141.102 (talk) 15:43, 29 March 2011 (UTC)

feature of IPv6 Protocols

we want the features IPv6 protocols —Preceding unsigned comment added by Suresh514 (talk • contribs) 17:52, 3 October 2010 (UTC)

Can you be clear? This article doesn't cover the protocol-see IPv6 for that.Jasper Deng (talk) 00:03, 13 January 2011 (UTC)

Special addresses

Although it is mentioned in the article, the address ff02::1 does not appear in special addresses. This address is very important because it represents the IPv4 broadcast (it is the multicast group all-nodes). Should not be mentioned as an speciall address ? — Preceding unsigned comment added by Mtorrecilla (talk • contribs) 14:47, 10 February 2011 (UTC)

Sources?Jasper Deng (talk) 01:28, 12 February 2011 (UTC)

Sources ???. The IPv6 address article: IPv6 does not implement broadcast addressing. Broadcast's traditional role is subsumed by multicast addressing to the all-nodes link-local multicast group ff02::1 But we can see it in RFC 4861

Reading RFC 4291 I think that we should change FROM

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Solicited-Node multicast addresses

Main article: Solicited-node multicast address

• ff02::1:ff00:0/104 — The least significant 24 bits of the group ID are filled with the least significant 24 bits of the interface's unicast or anycast address. These addresses allow link-layer address resolution via Neighbor Discovery Protocol (NDP) on the link without disturbing all nodes on the local network. A host is required to join a Solicited-Node multicast group for each of its configured unicast or anycast addresses.

---

TO

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Reserved multicast addresses

The multicast addresses ff00::0/12 are reserved<ref name=rfc4291> and should never be assigned to any multicast group.

• ff01::1 and ff02::1 — All Nodes Addresses. These addresses identify the group of all IPv6 nodes, within scope 1 (interface-local) or 2 (link-local).
• ff01::2, ff02::2, and ff05::2 — All Routers Addresses. They identify the group of all IPv6 routers, within scope 1 (interface-local), 2 (link-local), or 5 (site-local).
• ff02::1:ff00:0/104 — Solicited-node multicast address. The least significant 24 bits of the group ID are filled with the least significant 24 bits of the interface's unicast or anycast address. These addresses allow link-layer address resolution via Neighbor Discovery Protocol (NDP) on the link without disturbing all nodes on the local network. A host is required to join a Solicited-Node multicast group for each of its configured unicast or anycast addresses.

---

Mtorrecilla (talk) 13:24, 14 February 2011 (UTC)

Acceptable, with the exception that "shall" should be "should" as per WP:MOS.Jasper Deng (talk) 03:43, 15 February 2011 (UTC)

The literal phrase in RFC 4291 is: The above multicast addresses are reserved and shall never be assigned to any multicast group. Mtorrecilla (talk) 09:42, 15 February 2011 (UTC)

Edited the text somewhat. I would like to propose the word "will", since that is what the authors of the RFC would like to convey with the word "shall" in a way that other RFC writers and implementors will understand. "Will" is the lay-man's way of saying this. —— _D^an_d^or ⁱ_D (talk) 12:00, 15 February 2011 (UTC)

We should indicate what is meant by "assignment to a multicast group"; either here or on the multicast wiki. Are they not a group themselves? —— _D^an_d^or ⁱ_D (talk) 12:06, 15 February 2011 (UTC)

I'm not native english, so i'm not able to see the diference. Perhaps, the correct word would be "should", because you shouldn't use these addresses (or you must not use them). Please, if you want, change the article and use the word that you think is better. About "assignment to a multicast group"..... I think that multicast wiki is better. Mtorrecilla (talk) 15:38, 15 February 2011 (UTC)

I agree, because that guideline is written in legal language which isn't appropriate for Wikipedia. It's technically possible but not actually permissible to use those addresses.Jasper Deng (talk) 18:04, 15 February 2011 (UTC)

Special address section, unique local addresses external reference

The reference to RFC1918 is correct in the ref name= part of <ref name=1918>RFC 1978 ... but incorrect in the text for the reference. Links to RFCs are autocreated from the TEXT not the tag, and this makes the external link at the bottom of the page direct users to RFC 1978, PPP Predictor Compression Protocol, NOT RFC 1918. Correct line should be <ref name=1918>RFC 1918, ...</ref> NOT <ref name=1918>RFC 1978, ...</ref> . My edit from 2/16 at 20:38 was correct, and should not have been reverted. 71.195.229.210 (talk) 21:00, 16 February 2011 (UTC)

United States Department of Defense allocation

The ARIN allocations to US DoD are controversial. But I do not think it factually accurate to say they got a /13, when they got 14x /22 (USDDD-001 to USDDD-014), evenly spaced out over a /13.

I am unsure why SixXS lists it as a /13, as they have never seen it announced, and it is not coming from ARIN data. --Cybjit (talk) 21:06, 16 February 2011 (UTC)

We can say 14 /22s.Jasper Deng (talk) 00:51, 17 February 2011 (UTC)

Yes, changed it now. --Cybjit (talk) 20:07, 17 February 2011 (UTC)

Scientific notation is an approximation while powers of two are exact

I'd like to remind editors of this article that when representing numbers in scientific notation or otherwise in the base 10 systems, remember to say "about" or "approximate," because most of those numbers are only approximations of the real base 2 numbers. For example, 2³² is only approximated by 4.3 x 10⁹.Jasper Deng (talk) 00:51, 18 February 2011 (UTC)

Versions

I think the editor who reverted my edit misunderstands the concept of IP versions. IPv4 is the fourth version and IPv6 the sixth, regardless of whether versions 1-3 or 5 were deployed or not. I undid the edit back. Please don't revert again unless you can prove me wrong here.Jasper Deng (talk) 02:08, 20 February 2011 (UTC)

Your edit is unreferenced and (imo) dubious. It doesn't matter what you or I say about this, and in the absence of a reliable source, I'm going to edit it to not specify that either way.Rememberway (talk) 02:38, 20 February 2011 (UTC)

The source is the IPv6 article.Jasper Deng (talk) 03:09, 20 February 2011 (UTC)

OK, first, wikipedia articles aren't sources. Second, the only thing I could find in the article was it described as version 6 of the internet protocol. That's actually different from it being the sixth version of the internet protocol. 'version 6' is a name, whereas sixth version means that there's actually been 5 previous versions. If that sounds dubious, consider that you can often have version 4.3 of a release of software or protocols, but you can never have the 4.3th version of software. There is actually a difference.Rememberway (talk) 04:00, 20 February 2011 (UTC)

Wikipedia articles are OK for sources for other Wikipedia articles, as I've seen elsewhere. And anyhow, let's just say version 6. Is this consensus?Jasper Deng (talk) 04:03, 20 February 2011 (UTC)

"Wikipedia articles are OK for sources for other Wikipedia articles, as I've seen elsewhere." Nah. Sorry. Which policy are you claiming says this?Rememberway (talk) 04:15, 20 February 2011 (UTC)

It's not a policy, but it's just copy and pasting, with the reference, so the reference carries over. I should have said it differently.Jasper Deng (talk) 04:17, 20 February 2011 (UTC)

If we stick to version 6 of the Internet Protocol we are neutral and avoid using the version number as an ordinal number. According to Internet Protocol#Version history, IPv6 can be regarded (if you stretch it) as the sixth version of IP (versions 0-3 for testing, 4 for IPv4, and 6 for IPv6, which makes 6 versions). But the version number is in NO way related to its ordinality; if Internet Stream Protocol did not exist, IPv6 would surely be named IPv5 (and still be the sixth version of IP). If version number 6 were given to another protocol before IPv6 was launched, it could be IPv7, or IPv41 for that matter. It is version 6 just because '6' was a free number. — Preceding unsigned comment added by Dandorid (talk • contribs) 12:43, 24 February 2011 (UTC)

In that sense it's the 7th IP; IPv5 did exist, it's just not been widely released; and it was allocated an IP version number.Rememberway (talk) 16:37, 24 February 2011 (UTC)

IPv6 prefixes

I think it would be a good idea to visualize assigned prefixes and explicitly state their ranges both in hex ( http://www.sabi.co.uk/Notes/swIPv6Prefixes.html ) and in binary (like this http://ip-doc.com/rfc/rfc2373 but with the correct information, of course). Any thoughts? PAStheLoD (talk) 17:13, 6 May 2011 (UTC)

Correct statement?

Under http://en.wikipedia.org/wiki/IPv6_address#Networks, a statement is made, "For example, the configuration of an interface with address 2001:db8:a::123 connected to subnet 2001:db8:a::/64 is written as 2001:db8:a::123/64". Is this correct? When I read it, I thought that "... an interface with address 2001:db8:a::123 connected to subnet 2001:db8:a::/48 is written as 2001:db8:a::123/64". Wouldn't the subnet be a 48-bit prefix, not a 64-bit prefix? I didn't know enough to be 100% positive, so I didn't change it. — Bryan Burgers (talk) 14:15, 13 June 2011 (UTC)

Either is correct in terms of syntax. Whether you have a /48 or /64 depends on what your ISP gives you though, you can't change from one to the other just because there's zeroes in the address. -Rememberway (talk) 15:41, 13 June 2011 (UTC)

As Rememberway said, it is correct. A ipv6 address 2001:db8:a::123/64 belongs to the IPv6 network 2001:0db8:000a:0000::/64. Is it more clear in this way ?

If you write the ipv6 2001:db8:a::123/48, its IPv6 network is 2001:0db8:000a::/48, that it is different Mtorrecilla (talk) 16:29, 14 June 2011 (UTC)