[caiu] DNS Google perdendo pacote

Segunda Maio 12 11:38:35 BRT 2014

Prezados Shombra e demais,

On 05/12/2014 10:32 AM, Shombra wrote:

> alguém mais esta com problema para o 8.8.8.8?
>
> --- 8.8.8.8 ping statistics ---
> 204 packets transmitted, 162 packets received, 20% packet loss
> round-trip min/avg/max/stddev = 0.433/0.670/18.244/1.402 ms
>
> --- 8.8.8.8 ping statistics ---
> 483 packets transmitted, 364 packets received, 24.6% packet loss
> round-trip min/avg/max/stddev = 2.472/14.541/120.000/12.572 ms

Esse assunto já foi discutido na semana passada aqui na lista, 
aparentemente trata-se de limitação de tráfego ICMP pelo próprio Google.

Acabei de fazer 10 testes de solicitação de consulta DNS para o servidor 
8.8.8.8 e todas foram atendidas sem erro conforme segue:

###############################################################################
ptt.br (200.160.1.10) :~$ dig www.google.com @8.8.8.8

; <<>> DiG 9.8.1-P1 <<>> www.google.com @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36679
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.			IN	A

;; ANSWER SECTION:
www.google.com.		173	IN	A	74.125.196.105
www.google.com.		173	IN	A	74.125.196.147
www.google.com.		173	IN	A	74.125.196.104
www.google.com.		173	IN	A	74.125.196.103
www.google.com.		173	IN	A	74.125.196.99
www.google.com.		173	IN	A	74.125.196.106

;; Query time: 1 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon May 12 11:13:58 2014
;; MSG SIZE  rcvd: 128

ptt.br (200.160.1.10) :~$
###############################################################################
ptt.br (200.160.1.10) :~# tcpdump -i eth0 -n host 8.8.8.8
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
11:13:49.466902 IP 200.160.1.10.49115 > 8.8.8.8.53: 16601+ A? 
www.google.com. (32)
11:13:49.467981 IP 8.8.8.8.53 > 200.160.1.10.49115: 16601 6/0/0 A 
74.125.21.104, A 74.125.21.106, A 74.125.21.105, A 74.125.21.103, A 
74.125.21.147, A 74.125.21.99 (128)
11:13:52.562485 IP 200.160.1.10.34632 > 8.8.8.8.53: 41465+ A? 
www.google.com. (32)
11:13:52.563515 IP 8.8.8.8.53 > 200.160.1.10.34632: 41465 6/0/0 A 
74.125.21.104, A 74.125.21.106, A 74.125.21.105, A 74.125.21.103, A 
74.125.21.147, A 74.125.21.99 (128)
11:13:53.850310 IP 200.160.1.10.32956 > 8.8.8.8.53: 41307+ A? 
www.google.com. (32)
11:13:53.851367 IP 8.8.8.8.53 > 200.160.1.10.32956: 41307 6/0/0 A 
74.125.29.105, A 74.125.29.104, A 74.125.29.99, A 74.125.29.147, A 
74.125.29.103, A 74.125.29.106 (128)
11:13:54.505553 IP 200.160.1.10.52282 > 8.8.8.8.53: 16409+ A? 
www.google.com. (32)
11:13:54.506605 IP 8.8.8.8.53 > 200.160.1.10.52282: 16409 6/0/0 A 
74.125.196.147, A 74.125.196.103, A 74.125.196.106, A 74.125.196.99, A 
74.125.196.104, A 74.125.196.105 (128)
11:13:55.569362 IP 200.160.1.10.45715 > 8.8.8.8.53: 32878+ A? 
www.google.com. (32)
11:13:55.570435 IP 8.8.8.8.53 > 200.160.1.10.45715: 32878 6/0/0 A 
74.125.137.105, A 74.125.137.99, A 74.125.137.147, A 74.125.137.103, A 
74.125.137.106, A 74.125.137.104 (128)
11:13:56.169128 IP 200.160.1.10.49206 > 8.8.8.8.53: 34954+ A? 
www.google.com. (32)
11:13:56.170251 IP 8.8.8.8.53 > 200.160.1.10.49206: 34954 6/0/0 A 
74.125.21.105, A 74.125.21.103, A 74.125.21.106, A 74.125.21.99, A 
74.125.21.104, A 74.125.21.147 (128)
11:13:56.728991 IP 200.160.1.10.48325 > 8.8.8.8.53: 43096+ A? 
www.google.com. (32)
11:13:56.730055 IP 8.8.8.8.53 > 200.160.1.10.48325: 43096 6/0/0 A 
74.125.21.105, A 74.125.21.103, A 74.125.21.106, A 74.125.21.99, A 
74.125.21.104, A 74.125.21.147 (128)
11:13:57.217340 IP 200.160.1.10.32966 > 8.8.8.8.53: 49648+ A? 
www.google.com. (32)
11:13:57.218441 IP 8.8.8.8.53 > 200.160.1.10.32966: 49648 6/0/0 A 
74.125.196.147, A 74.125.196.103, A 74.125.196.106, A 74.125.196.99, A 
74.125.196.104, A 74.125.196.105 (128)
11:13:57.720310 IP 200.160.1.10.49441 > 8.8.8.8.53: 787+ A? 
www.google.com. (32)
11:13:57.721434 IP 8.8.8.8.53 > 200.160.1.10.49441: 787 6/0/0 A 
74.125.21.104, A 74.125.21.99, A 74.125.21.147, A 74.125.21.105, A 
74.125.21.103, A 74.125.21.106 (128)
11:13:58.217384 IP 200.160.1.10.55008 > 8.8.8.8.53: 36679+ A? 
www.google.com. (32)
11:13:58.218518 IP 8.8.8.8.53 > 200.160.1.10.55008: 36679 6/0/0 A 
74.125.196.105, A 74.125.196.147, A 74.125.196.104, A 74.125.196.103, A 
74.125.196.99, A 74.125.196.106 (128)

^C
20 packets captured
20 packets received by filter
0 packets dropped by kernel
ptt.br (200.160.1.10) :~#
###############################################################################

Atenciosamente,

-- 

Eduardo Ascenço Reis

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