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FYI: Valid and invalid ipv6 in .dk
![[dk]](/s/countries/dk.gif) Shadow Hawkins on Thursday, 13 January 2011 10:40:25
I did a scan of .dk-domains for ipv6-adresses.
I found 182 domains with adresses like ::ffff:a.b.c.d
None were pingable; is it a valid adress?
5 domains; 3 hosts with fe80:: adresses
7 domains with a popular dns-providers default 1234:1234:1234:1234:1234:1234:1234:1234
4 smartasses with ::1 adress
one host with an ipv4-adress in the AAAA record
two domains with empty AAAA record
Just 92 unique valid hosts, around 174 domains.
Not very promising....
FYI: Valid and invalid ipv6 in .dk
I found 182 domains with adresses like ::ffff:a.b.c.d None were pingable; is it a valid adress?
Technically it is a valid IPv6 address, but it should never be used on the wire or in representation, only in program-internal structures to be able to represent both an IPv4 and IPv6 address in the same structure.
Having an AAAA ::ffff.a.b.c.d is useless and does not work.
(It used to mean that one should build up a proto-41 tunnel to that IPv4 address and then send IPv6 packets over that using the given "IPv6" address as a destination.... you can see the security issues and other weird implications there I guess, as how do you know how to send the packets back ;)
FYI: Valid and invalid ipv6 in .dk
![[nl]](/s/countries/nl.gif) Shadow Hawkins on Friday, 14 January 2011 01:56:11
The loopback is funny. A IPv4 address in a AAAA record happened to me as well a few days ago :)
I use a non IPv6 aware dynamic dns client (directupdate), and it updates my dynamic IP with zoneedit for years and years without issue, until I decided to add a Quad A for an already existing A record. The utility updated both the A and the AAAA record, resulting in zoneedit not answering any queries for the whole domain, as the zonefile contained errors :)
For now I simply disabled the hostname in question from being automatically updated, it's not like my IP changes that often anyway.
FYI: Valid and invalid ipv6 in .dk
Shadow Hawkins on Sunday, 23 January 2011 20:54:13
There should be one host more now (i1.dk) - fell free to test.
I had the AAAA record disabled due to some problems with btexact tunnel and a flaky xdsl modem years ago.
FYI: Valid and invalid ipv6 in .dk
Shadow Hawkins on Monday, 24 January 2011 11:09:35
Nope.
PING 2001:16d8:dd31:1:20d:93ff:fe73:ac12(2001:16d8:dd31:1:20d:93ff:fe73:ac12) 56 data bytes
From 2002:5359:6406::1 icmp_seq=1 Destination unreachable: Port unreachable
Your ipv6 is probably "randomized" by your OS.
For windows, see http://www.tienhuis.nl/archives/16
For Linux(Debian) I have in /etc/network/interfaces:
iface eth0 inet6 static
pre-up modprobe ipv6
pre-up sysctl -w net.ipv6.conf.all.autoconf=0
pre-up sysctl -w net.ipv6.conf.eth0.autoconf=0
address 2001:16d8:ddxx:::y
netmask 64
up ip -6 route add 2000::/3 via 2001:16d8:ddxx::1
(One of sysctl's could probably be omitted)
Leif
FYI: Valid and invalid ipv6 in .dk
Shadow Hawkins on Tuesday, 25 January 2011 13:01:54
Ahh.. My firewall did not allow ping initiated from the outside. Fixed.
FYI: Valid and invalid ipv6 in .dk
Shadow Hawkins on Monday, 24 January 2011 11:13:09
Sorry; there is more in this world than ping.
Website is up.
Btw, next lunar eclipse is June 15 :-)
FYI: Valid and invalid ipv6 in .dk
Shadow Hawkins on Monday, 31 January 2011 09:30:46
Wow, the tally is in: "My" tunnel at work has 61% of danish www ipv6 domains.
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![[ch]](/s/countries/ch.gif)
on Thursday, 13 January 2011 16:57:28
Posting is only allowed when you are