Google and IPv6 inverse?

Mon Jun 6 16:38:37 UTC 2011

On Mon, 06 Jun 2011 08:19:37 +0300, Hank Nussbacher wrote:

> Will Google have inverse working by June 8th?
>
> [hank at noc ~]$ traceroute6 ipv6.google.com
> traceroute to ipv6.l.google.com (2a00:1450:8001::68) from
> 2001:bf8:0:3:202:b3ff:feaf:f3fc, 30 hops max, 16 byte packets
> 1 2001:bf8:0:3::1 (2001:bf8:0:3::1) 0.407 ms 221.144 ms 5.218 ms
> 2 2001:bf8:0:b::1 (2001:bf8:0:b::1) 0.559 ms 0.54 ms 0.486 ms
> 3 iucc-lb1.rt1.fra.de.geant2.net (2001:798:14:10aa::1d) 50.665
> ms 50.611 ms 50.567 ms
> 4 google-gw.rt1.fra.de.geant2.net (2001:798:14:10aa::e) 56.821
> ms 50.525 ms 50.486 ms
> 5 2001:4860::1:0:11 (2001:4860::1:0:11) 51.266 ms 51.106 ms 51.068 ms
> 6 2001:4860::1:0:4b3 (2001:4860::1:0:4b3) 58.309 ms 58.078 ms 58.442 
> ms
> 7 2001:4860::8:0:2db0 (2001:4860::8:0:2db0) 57.174 ms 57.339 ms 
> 57.195
> ms
> 8 2001:4860::2:0:66f (2001:4860::2:0:66f) 72.496 ms 60.803 ms 72.381 
> ms
> 9 2001:4860:0:1::1b (2001:4860:0:1::1b) 68.165 ms 62.21 ms 70.3 ms
> 10 2a00:1450:8001::68 (2a00:1450:8001::68) 61.21 ms 61.862 ms 61.331 
> ms
>

In some regions Google has revere DNS for IPv6 already:

Ryan-Rawdons-Work-MacBook-Pro:~ ryan$ traceroute6 ipv6.google.com
traceroute6 to ipv6.l.google.com (2001:4860:800f::67) from [redacted], 
64 hops max, 12 byte packets
  1  [redacted]
  2  2001:4870:4000:5::1  7.953 ms  8.540 ms  9.697 ms
  3  2001:506:8:ffff::3  24.895 ms  26.349 ms  24.993 ms
  4  2001:4860::1:0:5db  25.654 ms  32.175 ms  26.444 ms
  5  2001:4860::1:0:9ff  112.931 ms  60.227 ms  56.638 ms
  6  2001:4860:0:1::14f  37.783 ms  24.640 ms  34.077 ms
  7  iad04s01-in-x67.1e100.net  25.574 ms  24.359 ms  24.719 ms
Ryan-Rawdons-Work-MacBook-Pro:~ ryan$

They're doing it at about the same level as their IPv4 reverse DNS, 
that is, servers seem to have reverse DNS but intermediate hops in their 
infrastructure do not:

Ryan-Rawdons-Work-MacBook-Pro:~ ryan$ traceroute mail.google.com
traceroute: Warning: mail.google.com has multiple addresses; using 
72.14.204.83
traceroute to googlemail.l.google.com (72.14.204.83), 64 hops max, 52 
byte packets
  1  [redacted]
  2  [redacted]
  3  64-129-129-49.static.twtelecom.net (64.129.129.49)  7.057 ms  7.956 
ms  7.439 ms
  4  dist-02-xe-0-0-0.milw.twtelecom.net (66.192.246.82)  7.082 ms  
6.975 ms  8.139 ms
  5  216.239.48.108 (216.239.48.108)  9.187 ms  32.129 ms  107.103 ms
  6  66.249.94.46 (66.249.94.46)  10.923 ms
     66.249.94.54 (66.249.94.54)  8.839 ms  12.205 ms
  7  iad04s01-in-f83.1e100.net (72.14.204.83)  8.592 ms  9.672 ms  9.032 
ms
Ryan-Rawdons-Work-MacBook-Pro:~ ryan$