[dns-operations] Truncated EDNS0 answer from server A, B, C, D, E, G and J

Eduardo Mercader Orta emercade at nic.cl
Thu May 6 00:48:50 UTC 2010


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Hello,

   people in our offices in Chile, saw that the queries:

dig @a.root-servers.net . any +dnssec

was truncated in UDP, for root servers A, B, C, D, E, G and J

and must be redirect to TCP.

I repeat the same test here in Prague, and i see the same result.

By example, in the case of the root servers C, from Santiago, i have the
next traceroute:

[emercade at nicolette ~]$ traceroute -n c.root-servers.net
traceroute to c.root-servers.net (192.33.4.12), 30 hops max, 40 byte packets
 1  200.27.115.1  0.187 ms  0.169 ms  0.146 ms
 2  200.27.103.25  0.728 ms  0.708 ms  0.685 ms
 3  190.208.5.14  1.034 ms  1.013 ms  0.952 ms
 4  195.22.221.113  1.347 ms  1.412 ms  1.485 ms
 5  154.54.10.113  109.204 ms  122.987 ms  109.163 ms
 6  154.54.24.233  109.424 ms 154.54.28.249  109.407 ms 154.54.1.185
126.977 ms
 7  154.54.3.25  123.500 ms  123.330 ms  137.424 ms
 8  154.54.28.213  148.927 ms 154.54.24.9  151.588 ms 154.54.28.50
127.014 ms
 9  154.54.26.37  135.215 ms 154.54.2.193  154.097 ms  140.192 ms
10  154.54.29.122  139.844 ms  137.444 ms  137.523 ms
11  154.54.2.70  135.735 ms  135.726 ms  135.680 ms
12  192.33.4.12  136.242 ms  136.362 ms  150.306 ms

In Prague i have a diferent traceroute:

[emercade at fobos ~]$ traceroute -n c.root-servers.net
traceroute to c.root-servers.net (192.33.4.12), 30 hops max, 60 byte packets
 1  193.0.27.253  13.762 ms  13.852 ms  13.926 ms
 2  89.235.0.169  12.962 ms  13.251 ms  13.905 ms
 3  213.200.74.93  14.119 ms  14.198 ms  14.435 ms
 4  213.200.82.14  18.262 ms  18.386 ms  19.235 ms
 5  130.117.14.85  20.939 ms  22.550 ms 77.67.74.42  22.907 ms
 6  130.117.51.221  24.046 ms  17.330 ms  17.720 ms
 7  130.117.2.222  17.269 ms  17.544 ms  17.476 ms
 8  192.33.4.12  17.463 ms  17.269 ms  17.714 ms

So i think that they are diferent instances of the same root server C.
But the dig are similar (see attach files).

Must be considered as normal behavior ?

Regards,

Edo/

- -- 
Eduardo Mercader Orta
Jefe de Sistemas
NIC Chile - Universidad de Chile
http://www.nic.cl
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