NAT64 and matching identities

Tony Hain alh-ietf at tndh.net
Fri Nov 22 23:50:00 UTC 2013


Someone from Alexa really needs to answer how that list is created because
their web site discussion is way too hand-wavy, but given that neither of
those appear to be currently valid names, and 1.1.1.1 is on the list at all,
there must be some measure of cross link and redirection occurrences. For
the entire top-1m, I show today's file has 2815 as dotted-quad. In the top
50,000 there are 1790 with "no IPv4   no IPv6".  Clearly they don't bother
to prune the list for validity. ~4% of the next 25,000 names are dead
(50,000-75,000), and one can only guess that as you get further down the
list the percentage of dead names will continue to go up. I have a full 1M
run in process, but would not count on it completing before Monday.

Just to add a level of 'extra effort' to the process, I increased the number
of attempts to 10, and the time between attempts to 10 seconds. With that,
dead names in the top 1000:
akamaihd.net                    no IPv4   no IPv6
bp.blogspot.com                 no IPv4   no IPv6
delta-search.com                no IPv4   no IPv6
bannersdontwork.com             no IPv4   no IPv6
cloudfront.net                  no IPv4   no IPv6
doorblog.jp                     no IPv4   no IPv6
uimserv.net                     no IPv4   no IPv6
linksynergy.com                 no IPv4   no IPv6
lipixeltrack.com                no IPv4   no IPv6
australianbrewingcompany.com    no IPv4   no IPv6
searchfun.in                    no IPv4   no IPv6
greatappsdownload.com           no IPv4   no IPv6
klikbca.com                     no IPv4   no IPv6
jobfindgold.info                no IPv4   no IPv6
adnxs.com                       no IPv4   no IPv6
rakuten.ne.jp                   no IPv4   no IPv6
sweetpacks-search.com           no IPv4   no IPv6
yomiuri.co.jp                   no IPv4   no IPv6
incredibar-search.com           no IPv4   no IPv6
searchgol.com                   no IPv4   no IPv6
livedoor.biz                    no IPv4   no IPv6
workercn.cn                     no IPv4   no IPv6

FWIW: in the top 50,000, I show 1525 "has IPv4  has IPv6" &  0  "no IPv4
has IPv6". In other words, there are more dead names than there are AAAA
records, and there are not any IPv6-only sites in that group.

Tony


> -----Original Message-----
> From: Owen DeLong [mailto:owen at delong.com]
> Sent: Friday, November 22, 2013 1:48 PM
> To: Tony Hain
> Cc: joel jaeggli; Valdis.Kletnieks at vt.edu; NANOG List
> Subject: Re: NAT64 and matching identities
> 
> So one has to wonder how those names made it into the top 100 list if it's
> supposed to be a top 100 web sites, since they are obviously not web
sites.
> (at least in the case of the two in the top 100)
> 
> Owen
> 
> On Nov 22, 2013, at 1:28 PM, Tony Hain <alh-ietf at tndh.net> wrote:
> 
> > The only thing it explicitly strips out are dotted-quads, which don't
> > occur until # 4255. The code makes five passes at getaddrinfo() for
> > IPv4 before giving up, and then it checks for a leading www and if
> > that exists it strips it off and does the 5 tries loop again, then
> > later the same process for IPv6. For the top 100 run:
> > akamaihd.net                    no IPv4   no IPv6
> > bp.blogspot.com                 no IPv4   no IPv6
> >
> > FWIW :::
> > Dotted-quad's in the top 10,000
> > 4255,92.242.195.24
> > 4665,1.1.1.1
> > 5079,92.242.195.231
> > 6130,1.254.254.254
> > 9518,208.98.30.70
> >
> >> whois 92.242.195.24
> > ...
> > netname:        Respina
> > descr:          BroadBand IP Pool
> > country:        IR
> > ...
> > route:          92.242.195.0/24
> >
> > Respina BroadBand IP Pool in the top 100,000
> > 4255,92.242.195.24
> > 5079,92.242.195.231
> > 10059,92.242.195.233
> > 23912,92.242.195.30
> > 31520,92.242.195.111
> > 35867,92.242.195.235
> > 95233,92.242.195.129
> >
> >
> >> -----Original Message-----
> >> From: Owen DeLong [mailto:owen at delong.com]
> >> Sent: Friday, November 22, 2013 12:16 PM
> >> To: joel jaeggli
> >> Cc: Valdis.Kletnieks at vt.edu; Tony Hain; NANOG List
> >> Subject: Re: NAT64 and matching identities
> >>
> >> It would be way more than 2 if it were CNAME, methinks.
> >>
> >> Owen
> >>
> >> On Nov 22, 2013, at 12:12 PM, joel jaeggli <joelja at bogus.com> wrote:
> >>
> >>> On 11/22/13, 12:01 PM, Valdis.Kletnieks at vt.edu wrote:
> >>>> On Fri, 22 Nov 2013 10:18:27 -0800, "Tony Hain" said:
> >>>>
> >>>>> The top 100 websites: AAAA records and IPv6 connectivity
> >>>>>          count with A:       98   ( 98.000%)
> >>>>>       count with AAAA:       30   ( 30.000%)
> >>>>> Of the 30 hosts with AAAA records, testing connectivity to TCP/80:
> >>>>>    count with IPv6 ok:       30   (100.000%)
> >>>>
> >>>> Statistics whoopsie, or are there actually 2 sites in the top100
> >>>> that are IPv6-only?
> >>>
> >>> IN CNAME ? or is that being accounted for.
> >>>
> >>>
> >>>




More information about the NANOG mailing list