<CT> Re: calmira.org is down?

  • From: "Brian L. Johnson" <dapenguin@xxxxxxxxxx>
  • To: calmira_tips@xxxxxxxxxxxxx
  • Date: Wed, 20 Nov 2002 10:12:02 -0700 (MST)

The Entity currently known as Reid emitted:

>Seems to be fine now.

Hmm, not for me. The site itself is working fine, but the DNS is
b0rked.

I did some digging, and here's the situation:

The DNS for calmira.org is on ns1.dnsmadeeasy.com and
ns2.dnsmadeeasy.com. However, ns1 is experiencing what's called a
"router loop".

A router loop is where one router is supposed to hand traffic off to
another, which is in turn supposed to pass it on, but instead that
second router hands off to the first one, which tries to hand off to
the second one, and so on... As you can no doubt guess, this just
doesn't work.

traceroute to ns1.dnsmadeeasy.com (64.50.168.187), 30 hops max, 38
byte packets
 1  ca2.pcisys.net (216.229.32.150)  99.130 ms  100.721 ms  88.835
ms
 2  moe.pcisys.net (216.229.32.145)  99.885 ms  99.792 ms  89.895 ms
 3  cartman-s3-0.pcisys.net (216.229.32.161)  99.860 ms  89.913 ms
99.936 ms
 4  border10.s6-4.pcisys-1.den.pnap.net (216.52.42.13)  99.717 ms
99.782 ms  99.879 ms
 5  core1.ge3-0-bbnet2.den.pnap.net (216.52.40.65)  99.900 ms
99.768 ms  99.888 ms
[snip some packets in the middle]
16  g50.ba01.b005897-1.dca01.atlas.cogentco.com (66.28.6.118)
179.874 ms  179.778 ms  219.875 ms
17  Network-Access-Solutions.demarc.cogentco.com (66.28.28.30)
149.909 ms  149.642 ms  149.899 ms
18
64.50.208.10 (64.50.208.10)  169.887 ms  169.741 ms  179.866 ms
19  63.210.30.132 (63.210.30.132)  170.060 ms  199.720 ms  179.875
ms
20  64.50.208.33 (64.50.208.33)  159.887 ms  149.779 ms  149.898 ms
21  64.50.208.10 (64.50.208.10)  169.903 ms  169.777 ms  169.887 ms
22  63.210.30.132 (63.210.30.132)  169.914 ms  169.927 ms  179.726
ms
23  64.50.208.33 (64.50.208.33)  149.881 ms  149.732 ms  149.821 ms
[more snip]

So what's happening is there's a THREE-way loop going on at the
upstream, Cogentco. And since the main DNS for dnsmadeeasy and it's
clients is on ns1, well whoops. AND, since ns1.dnsmadeeasy.com and
www.dnsmadeeasy.com are the same machine, THEIR website is down as
well.

-=Brian=-
rm -rf /bin/laden

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