Não consigo conectar-me à Internet a partir do Ubuntu (versão 14.04.01 LTS). Eu tentei soluções em posts relacionados no fórum, mas nenhum deles funcionou até agora. Qualquer ajuda para resolver isso seria muito apreciada.
Eu posso abrir o firefox e usar a internet de lá, mas um exemplo da saída do ping é:
ping: host desconhecido www.google.com
A saída do ifconfig é:
eth0 Link encap:Ethernet HWaddr 00:25:90:58:f7:74
inet addr:172.21.3.42 Bcast:172.21.255.255 Mask:255.255.0.0
inet6 addr: fe80::225:90ff:fe58:f774/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:78128 errors:0 dropped:35 overruns:0 frame:0
TX packets:16658 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9206366 (9.2 MB) TX bytes:2853288 (2.8 MB)
Memory:f0000000-f0020000
eth1 Link encap:Ethernet HWaddr 00:25:90:58:f7:75
inet addr:172.21.10.67 Bcast:172.21.255.255 Mask:255.255.0.0
inet6 addr: fe80::225:90ff:fe58:f775/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:61518 errors:0 dropped:30 overruns:0 frame:0
TX packets:1359 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7464478 (7.4 MB) TX bytes:146052 (146.0 KB)
Memory:f0040000-f0060000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:84984 errors:0 dropped:0 overruns:0 frame:0
TX packets:84984 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9607658 (9.6 MB) TX bytes:9607658 (9.6 MB)
A saída do netstat -r -n é:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 172.21.0.1 0.0.0.0 UG 0 0 0 eth1
172.21.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
172.21.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
O arquivo de interfaces tem as seguintes linhas:
/etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
#auto lo eth0
#iface lo inet loopback
auto lo
iface lo inet loopback
iface eth0 inet static
address 172.21.3.42
netmask 255.255.0.0
gateway 172.21.0.1
# dns-search www.google.com
dns-nameservers 172.21.3.1
A saída da ferramenta nm é:
nm-tool
NetworkManager Tool
State: connected (global)
- Device: eth1 [E2] -----------------------------------------------------------
Type: Wired
Driver: igb
State: connected
Default: yes
HW Address: 00:25:90:58:F7:75
Capabilities:
Carrier Detect: yes
Speed: 1000 Mb/s
Wired Properties
Carrier: on
IPv4 Settings:
Address: 172.21.10.67
Prefix: 16 (255.255.0.0)
Gateway: 172.21.0.1
DNS: 172.21.3.103
DNS: 172.21.3.1
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: igb
State: unmanaged
Default: no
HW Address: 00:25:90:58:F7:74
Capabilities:
Carrier Detect: yes
Speed: 1000 Mb/s
Wired Properties
Carrier: on
Usando
route -n
e também nm-tool :
Eu pude ver que a eth1 tinha sido definida como padrão e estava apontando para o endereço do gateway. Nossa configuração exigiu que a eth0 fosse o padrão. Isso foi resolvido usando:
sudo ip route change to default dev eth0 via 172.21.0.1
em que 172.21.0.1 é o endereço do gateway.