Meu sistema tem o Windows 7 e o Ubuntu 14.04 LTS (instalado usando wubi, dual os). conexão através de WiFi.
Problema : Alguns sites estão mostrando Esta página não está disponível no Ubuntu, mas funciona sem problemas no meu Windows 7.
(no chrome e também verificado no Firefox)
O que eu tentei, fazendo um pedido de ping através do terminal.
$ ping github.com
PING github.com (192.30.252.129) 56(84) bytes of data.
^C
--- github.com ping statistics ---
50 packets transmitted, 0 received, 100% packet loss, time 49391ms
e o facebook também falha
PING facebook.com (173.252.120.6) 56(84) bytes of data.
^C
--- facebook.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4031ms
Outros sites, que funcionam
PING superuser.com (198.252.206.140) 56(84) bytes of data.
64 bytes from stackoverflow.com (198.252.206.140): icmp_seq=1 ttl=51 time=307 ms
64 bytes from stackoverflow.com (198.252.206.140): icmp_seq=2 ttl=51 time=293 ms
64 bytes from stackoverflow.com (198.252.206.140): icmp_seq=3 ttl=51 time=308 ms
64 bytes from stackoverflow.com (198.252.206.140): icmp_seq=4 ttl=51 time=294 ms
^C
--- superuser.com ping statistics ---
6 packets transmitted, 5 received, 16% packet loss, time 5001ms rtt min/avg/max/mdev =293.672/299.820/308.726/6.920 ms
UPDATE
Pingando github.com do meu Windows 7, o que funciona!
$ ping github.com
Pinging github.com [192.30.252.129] with 32 bytes of data:
Reply from 192.30.252.129: bytes=32 time=535ms TTL=54
Reply from 192.30.252.129: bytes=32 time=557ms TTL=54
Reply from 192.30.252.129: bytes=32 time=422ms TTL=54
Reply from 192.30.252.129: bytes=32 time=469ms TTL=54
Ping statistics for 192.30.252.129:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 422ms, Maximum = 557ms, Average = 495ms
UPDATE - nenhum firewall presente parece
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Não tenho certeza de onde ir a partir daqui. Qualquer ajuda é muito apreciada. Obrigado!