Problem with Brazilian DNS servers
Sebastian E. Castro Avila
secastro at nic.cl
Wed Nov 9 23:16:58 UTC 2005
On Wed, 09 Nov 2005 17:49:36 -0300, Mike Mitchell <Mike.Mitchell at sas.com>
wrote:
I've sent a report to technical department of brazilian NIC about this.
I hope it helps.
> Has anyone noticed a problem with DNS servers in Brazil?
> I have problems looking up hosts in the following domains:
>
> bb.com.br predileto.ind.br ibi.com.br
> ig.com.br telemar.com.br
>
> I get spotty results when querying those domains. For example,
> clients with a 149.173.5.XX IP address can query the Brazilian
> nameservers with either UDP or TCP, but clients with 149.173.6.XX
> addresses can only use TCP. Packet captures at the Internet router
> shows queries going out but never see a UDP answer back. Since the
> TCP queries function properly I know it isn't a routing issue. I've
> tried 'dig' with a one-second timeout and a repeat count of 50, and
> the UDP query never succeeds. When I immediately try it again using
> TCP the answer comes back in 130ms. I am querying the Brazilian
> nameservers directly, i.e. 'dig @200.225.157.104 A www.ig.com.br.'
>
> I've tried the same queries at different points on the Internet and
> at some places it works, but others it doesn't. I've even seen a case
> where UDP worked but TCP didn't work.
>
> Mike Mitchell
> SAS Institute Inc.
> Mike.Mitchell at sas.com
> (919) 531-6793
>
>
--
Sebastian E. Castro Avila sebastian at nic.cl
Administrador de DNS, NIC Chile
Agustinas 1357 Piso 4
Santiago, Chile Cod. Postal 6500587
Phone: +56-2-9407705 Fax : +56-2-9407701
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