[caiu] Perda de pacotes dns google via PTT

[Eduardo Ascenco Reis]

Prezados Colegas,

A perda de pacotes observada para testes de ping (ICMP) não ocorre para 
IPv6 e nem para o tráfego de aplicações (e.g tcp/80).

Segue alguns testes:

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ptt.br (200.160.1.10) :~$ date; mtr -n -r -c 10 www.google.com
Sex Mai  9 19:33:41 BRT 2014
HOST: fly                         Loss%   Snt   Last   Avg  Best  Wrst StDev
   1.|-- 2001:12ff:0:1::1           0.0%    10    0.3   0.3   0.3   0.4 
   0.0
   2.|-- 2001:12ff:2:1::252         0.0%    10    0.4   2.8   0.3  23.8 
   7.4
   3.|-- 2001:12ff:1::173           0.0%    10    6.3   2.5   0.4  15.6 
   4.9
   4.|-- 2001:12f8::218:58          0.0%    10    1.0   1.1   1.0   1.8 
   0.3
   5.|-- 2001:4860::1:0:4f24        0.0%    10   10.5  14.3   1.6  20.7 
   5.5
   6.|-- 2001:4860::1:0:468c        0.0%    10   10.9  11.5  10.8  17.3 
   2.0
   7.|-- 2001:4860:0:1::74d         0.0%    10   11.0  11.0  10.9  11.0 
   0.0
   8.|-- 2800:3f0:4004:801::1014    0.0%    10   10.8  10.8  10.8  10.8 
   0.0
ptt.br (200.160.1.10) :~$

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ptt.br (200.160.1.10) :~$ date; mtr -4 -n -r -c 10 www.google.com
Sex Mai  9 19:33:58 BRT 2014
HOST: fly                         Loss%   Snt   Last   Avg  Best  Wrst StDev
   1.|-- 200.160.1.14               0.0%    10    0.3   1.8   0.3  14.6 
   4.5
   2.|-- 200.160.0.252              0.0%    10    0.3   3.3   0.3  29.8 
   9.3
   3.|-- 200.160.0.173              0.0%    10    0.4   0.4   0.4   0.4 
   0.0
   4.|-- 187.16.218.58             30.0%    10    1.0   1.1   1.0   1.1 
   0.0
   5.|-- 209.85.254.54             30.0%    10    1.2   5.9   1.1  34.6 
  12.6
   6.|-- 72.14.235.143             20.0%    10   10.6  10.7  10.5  11.4 
   0.3
   7.|-- 209.85.253.171            20.0%    10   10.9  10.8  10.8  10.9 
   0.0
   8.|-- 173.194.42.178            10.0%    10    8.6   8.6   8.6   8.6 
   0.0
ptt.br (200.160.1.10) :~$

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ptt.br (200.160.1.10) :~$ date; tcptraceroute www.google.com
Sex Mai  9 19:36:36 BRT 2014
Selected device eth0, address 200.160.1.10, port 48165 for outgoing packets
Tracing the path to www.google.com (173.194.42.177) on TCP port 80 
(http), 30 hops max
  1  ae1-22.ar3.nu.ptt.br (200.160.1.14)  0.342 ms  0.284 ms  0.276 ms
  2  ae0-0.core2.nu.registro.br (200.160.0.252)  0.362 ms  0.291 ms 
0.300 ms
  3  xe-0-0-1-0.gw2.nu.registro.br (200.160.0.173)  0.349 ms  0.329 ms 
0.322 ms
  4  as15169-s2.sp.ptt.br (187.16.218.58)  1.037 ms  0.991 ms  0.982 ms
  5  209.85.254.136  1.416 ms  1.423 ms  1.412 ms
  6  209.85.245.53  10.891 ms  10.949 ms  10.889 ms
  7  * * *
  8  rio01s06-in-f17.1e100.net (173.194.42.177) [open]  13.025 ms 
13.024 ms  13.030 ms
ptt.br (200.160.1.10) :~$

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Atenciosamente,

-- 

Eduardo Ascenço Reis


PTT.br - http://ptt.br/
NIC.br - http://nic.br/