1000 localhosts in DNS

[Dan Wing]

> -----Original Message-----
> From: ipv6-ops-bounces+dwing=cisco.com at lists.cluenet.de [mailto:ipv6-
> ops-bounces+dwing=cisco.com at lists.cluenet.de] On Behalf Of Thomas
> Schäfer
> Sent: Tuesday, June 21, 2011 1:22 PM
> To: ipv6-ops at lists.cluenet.de
> Subject: 1000 localhosts in DNS
> 
> Hi,
> 
> some discussions about ipv6- brokeness on client-site become obsolete
> as long
> on (web)server-site some people make bad jokes.
> 
> From 1 0000 000 tested sites 1 000 have ::1 in AAAA.

I don't know how you chose those 1,000,000 hosts to check.  I am checking
against Alexa's list, but my check this morning found only 100 (of 
1 million) had ::1 or "::",
http://banjo.employees.org/~dwing/aaaa-stats.html

I like the ones that list "::", too,
  # host listingdomains.com
  listingdomains.com has address 209.235.241.136
  listingdomains.com has IPv6 address ::
  listingdomains.com mail is handled by 10 mx1.emailsrvr.com.
but fortunately "::" causes an immediate failure (on clients I tried)
so doesn't slow down access.

> What should be done?
> Hoping somebody reads the list and removes his entries?
> Does it make sense to search all webmasters and contact them?

I wouldn't worry about it.  I just did DNS A and AAAA queries
using Alexa's list, and found 67 occurrences of IPv6 loopback:
  > grep -E " ::1" a-records.txt | wc
      67     536    5034

and for IPv4, found 226 occurrences of 127/8, 10/8, and 192.168/16,
which are also all inaccessible:
  > grep -E " 127\.| 10\.| 192\.168\." a-records.txt | wc
     226    1360   14361

So there is a reasonable amount of brokenness in the DNS --
even among Alexa's top 1 million sites.  I have no idea how
or why those sites are on Alexa's list with broken DNS
like that.


I suppose someone could set up a DNS "nanny" service to
email the webmasters or DNS contacts at the offending sites.
But the problem affects bogus records for both A and AAAA;
it isn't exclusively an AAAA problem.

-d


> 
> Regards,
> 
> Thomas
> 
> 
> PS: over 90% of the list-entries are also hosted at 68.178.232.143,
> whois says
> "GoDaddy"
> 
> 
> 
> 
> --
> 
> There’s no place like ::1
> 
> Thomas Schäfer (Systemverwaltung)
> Ludwig-Maximilians-Universität
> Centrum für Informations- und Sprachverarbeitung
> Schellingstraße 10 Raum J407A
> 80799 München ☎ +49/89/2180-9706  ℻ +49/89/2180-9701