North American Network Operators Group
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Re: .ORG problems this evening

  • From: Alex Bligh
  • Date: Thu Sep 18 04:52:45 2003 
Todd/Chris,


It makes me wonder how UltraDNS got a contract to manage the domain on
all of two nameservers hosted on the same subnet, given that they were
supposed to have deployed "geographically diverse" (or something like
that) servers. But then, we know ICANN smokes the crack liberally at
times....

Just because they hosts are on the same subnet and are apparently behind
the same end device for you doesn't make them non-geographically diverse
if they are really anycast pods, does it? It really just means one anycast
pod was down for a time :(
Not even that:

(a) being on the same /24 doesn't make them on the same subnet. We
have this thing called CIDR nowadays. Hell, being on the
same /32 doesn't make them on the same (physical) subnet with anycast.

(b) they aren't on the same /24 anyway. Specs needed.
Compare:

[email protected]:~$ host tld1.ultradns.net
tld1.ultradns.net has address 204.74.112.1
^===*****
[email protected]:~$ host tld2.ultradns.net
tld2.ultradns.net has address 204.74.113.1
^===*****

A quick inspection from your favourite looking glass will show that
there is a /23 and a /24 separately announced. Hence:

(c) at least from here, the routes are pretty diverse in any case
(see below). IE not only is (say) a west coast host served by different
servers than a European host, but the two European hosts are served by
different servers.

Alex


[email protected]:~$ traceroute tld1.ultradns.net
traceroute to tld1.ultradns.net (204.74.112.1), 30 hops max, 38 byte packets
1 195.82.114.1 (195.82.114.1) 0.917 ms 4.344 ms 6.131 ms
2 bdr1.lon-th1.mailbox.net.uk (195.82.97.226) 10.080 ms 4.050 ms 1.694 ms
3 195.82.96.70 (195.82.96.70) 1.552 ms 1.553 ms 2.138 ms
4 ge-1-3-0.r01.londen03.uk.bb.verio.net (217.79.161.10) 1.694 ms 11.200 ms 4.134 ms
5 ge-1-2.a01.londen03.uk.ra.verio.net (213.130.47.83) 150.565 ms 148.296 ms 199.156 ms
6 UltraDNS-0.a01.londen03.uk.ra.verio.net (213.130.48.38) 14.549 ms 8.962 ms 22.128 ms
7 dellfwabld.ultradns.net (204.74.106.2) 21.371 ms !H 27.196 ms !H 31.775 ms !H
[email protected]:~$ traceroute tld2.ultradns.net
traceroute to tld2.ultradns.net (204.74.113.1), 30 hops max, 38 byte packets
1 195.82.114.1 (195.82.114.1) 1.611 ms 3.728 ms 3.501 ms
2 bdr1.lon-th1.mailbox.net.uk (195.82.97.226) 8.889 ms 1.704 ms 3.333 ms
3 if-4-1-0.bb2.London.Teleglobe.net (195.219.2.1) 57.452 ms 140.352 ms 208.421 ms
4 if-6-0.core1.London.Teleglobe.net (195.219.96.82) 2.463 ms 7.007 ms 7.525 ms
5 if-1-0.core2.NewYork.Teleglobe.net (207.45.220.37) 82.125 ms 73.374 ms 92.908 ms
6 if-4-0.bb8.NewYork.Teleglobe.net (66.110.8.130) 76.796 ms 73.816 ms 77.613 ms
7 p3-3.IR1.NYC-NY.us.xo.net (206.111.13.13) 93.642 ms 83.092 ms 102.477 ms
8 p5-1-0-2.RAR2.NYC-NY.us.xo.net (65.106.3.65) 72.338 ms 72.658 ms 71.785 ms
9 p6-0-0.RAR1.Washington-DC.us.xo.net (65.106.0.2) 117.226 ms 76.936 ms 78.430 ms
10 p6-1-0.MAR1.Washington-DC.us.xo.net (65.106.3.182) 77.206 ms 84.026 ms 77.201 ms
11 p0-0.CHR1.Washington-DC.us.xo.net (207.88.87.10) 85.094 ms 77.777 ms 77.614 ms
12 64.124.112.141.ultradns.com (64.124.112.141) 85.226 ms 77.912 ms 78.143 ms
13 dellfwpxvn.ultradns.net (204.74.104.2) 77.940 ms !H 78.441 ms !H 97.738 ms !H