Não é possível obter atualizações, e-mail e acesso à Internet, Ubuntu 12.04 LTS

Question

Estou usando uma conexão sem fio.

O ícone de conexão no canto superior direito da tela indica que estou realmente conectado, mas o gerenciador de atualização, as conexões de e-mail e o acesso à Internet falham.

OS é o Ubuntu 12.04 LTS. Estou usando meu computador de trabalho para acessar esse site de ajuda, esperando alguma orientação para esses problemas. Eu sou novo no Ubuntu e Linux como um todo. A última atualização indicada é 30 de julho.

Dito isto, quaisquer sugestões para etapas de diagnóstico ou quaisquer outras orientações úteis serão apreciadas.

ping -c4 4.2.2.2 e route | grep default não retornaram nada.

ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:22:4d:50:b3:9e  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1 
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B) 
          Interrupt:20 Memory:f0400000-f0420000 

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:16436  Metric:1 
          RX packets:3384 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:3384 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:0 
          RX bytes:187028 (187.0 KB)  TX bytes:187028 (187.0 KB) 

wlan0     Link encap:Ethernet  HWaddr 6c:62:6d:23:d0:c0  
          inet addr:192.168.0.5  Bcast:192.168.0.255  Mask:255.255.255.0 
          inet6 addr: fe80::6e62:6dff:fe23:d0c0/64 Scope:Link 
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
          RX packets:32293 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:145 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:2382888 (2.3 MB)  TX bytes:10990 (10.9 KB) 

ip addr:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 
    inet 127.0.0.1/8 scope host lo 
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever 
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000 
    link/ether 00:22:4d:50:b3:9e brd ff:ff:ff:ff:ff:ff 
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 
    link/ether 6c:62:6d:23:d0:c0 brd ff:ff:ff:ff:ff:ff 
    inet 192.168.0.5/24 brd 192.168.0.255 scope global wlan0 
    inet6 fe80::6e62:6dff:fe23:d0c0/64 scope link 
       valid_lft forever preferred_lft forever

iwconfig:

eth0      no wireless extensions. 

lo        no wireless extensions. 

wlan0     IEEE 802.11bgn  ESSID:"CGnetwork"   
          Mode:Managed  Frequency:2.437 GHz  Access Point: A0:21:B7:F7:EF:DB    
          Bit Rate=72.2 Mb/s   Tx-Power=20 dBm    
          Retry  long limit:7   RTS thr:off   Fragment thr:off 
          Power Management:on 
          Link Quality=59/70  Signal level=-51 dBm   
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0 
          Tx excessive retries:13  Invalid misc:6   Missed beacon:0 

ping e dconf read não produziram resultados.

iptables -L:

Chain INPUT (policy DROP) 
target     prot opt source               destination          
ufw-before-logging-input  all  --  anywhere             anywhere             
ufw-before-input  all  --  anywhere             anywhere             
ufw-after-input  all  --  anywhere             anywhere             
ufw-after-logging-input  all  --  anywhere             anywhere             
ufw-reject-input  all  --  anywhere             anywhere             
ufw-track-input  all  --  anywhere             anywhere             

Chain FORWARD (policy DROP) 
target     prot opt source               destination          
ufw-before-logging-forward  all  --  anywhere             anywhere             
ufw-before-forward  all  --  anywhere             anywhere             
ufw-after-forward  all  --  anywhere             anywhere             
ufw-after-logging-forward  all  --  anywhere             anywhere             
ufw-reject-forward  all  --  anywhere             anywhere             

Chain OUTPUT (policy DROP) 
target     prot opt source               destination          
ufw-before-logging-output  all  --  anywhere             anywhere             
ufw-before-output  all  --  anywhere             anywhere             
ufw-after-output  all  --  anywhere             anywhere             
ufw-after-logging-output  all  --  anywhere             anywhere             
ufw-reject-output  all  --  anywhere             anywhere             
ufw-track-output  all  --  anywhere             anywhere             

Chain ufw-after-forward (1 references) 
target     prot opt source               destination          

Chain ufw-after-input (1 references) 
target     prot opt source               destination          
ufw-skip-to-policy-input  udp  --  anywhere             anywhere             udp dpt:netbios-ns 
ufw-skip-to-policy-input  udp  --  anywhere             anywhere             udp dpt:netbios-dgm 
ufw-skip-to-policy-input  tcp  --  anywhere             anywhere             tcp dpt:netbios-ssn 
ufw-skip-to-policy-input  tcp  --  anywhere             anywhere             tcp dpt:microsoft-ds 
ufw-skip-to-policy-input  udp  --  anywhere             anywhere             udp dpt:bootps 
ufw-skip-to-policy-input  udp  --  anywhere             anywhere             udp dpt:bootpc 
ufw-skip-to-policy-input  all  --  anywhere             anywhere             ADDRTYPE match dst-type BROADCAST 

Chain ufw-after-logging-forward (1 references) 
target     prot opt source               destination          
LOG        all  --  anywhere             anywhere             limit: avg 3/min burst 10 LOG level warning prefix "[UFW BLOCK] " 

Chain ufw-after-logging-input (1 references) 
target     prot opt source               destination          
LOG        all  --  anywhere             anywhere             limit: avg 3/min burst 10 LOG level warning prefix "[UFW BLOCK] " 

Chain ufw-after-logging-output (1 references) 
target     prot opt source               destination          
LOG        all  --  anywhere             anywhere             limit: avg 3/min burst 10 LOG level warning prefix "[UFW BLOCK] " 

Chain ufw-after-output (1 references) 
target     prot opt source               destination          

Chain ufw-before-forward (1 references) 
target     prot opt source               destination          
ufw-user-forward  all  --  anywhere             anywhere             

Chain ufw-before-input (1 references) 
target     prot opt source               destination          
ACCEPT     all  --  anywhere             anywhere             
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED 
ufw-logging-deny  all  --  anywhere             anywhere             state INVALID 
DROP       all  --  anywhere             anywhere             state INVALID 
ACCEPT     icmp --  anywhere             anywhere             icmp destination-unreachable 
ACCEPT     icmp --  anywhere             anywhere             icmp source-quench 
ACCEPT     icmp --  anywhere             anywhere             icmp time-exceeded 
ACCEPT     icmp --  anywhere             anywhere             icmp parameter-problem 
ACCEPT     icmp --  anywhere             anywhere             icmp echo-request 
ACCEPT     udp  --  anywhere             anywhere             udp spt:bootps dpt:bootpc 
ufw-not-local  all  --  anywhere             anywhere             
ACCEPT     udp  --  anywhere             224.0.0.251          udp dpt:mdns 
ACCEPT     udp  --  anywhere             239.255.255.250      udp dpt:1900 
ufw-user-input  all  --  anywhere             anywhere             

Chain ufw-before-logging-forward (1 references) 
target     prot opt source               destination          

Chain ufw-before-logging-input (1 references) 
target     prot opt source               destination          

Chain ufw-before-logging-output (1 references) 
target     prot opt source               destination          

Chain ufw-before-output (1 references) 
target     prot opt source               destination          
ACCEPT     all  --  anywhere             anywhere             
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED 
ufw-user-output  all  --  anywhere             anywhere             

Chain ufw-logging-allow (0 references) 
target     prot opt source               destination          
LOG        all  --  anywhere             anywhere             limit: avg 3/min burst 10 LOG level warning prefix "[UFW ALLOW] " 

Chain ufw-logging-deny (2 references) 
target     prot opt source               destination          
RETURN     all  --  anywhere             anywhere             state INVALID limit: avg 3/min burst 10 
LOG        all  --  anywhere             anywhere             limit: avg 3/min burst 10 LOG level warning prefix "[UFW BLOCK] " 

Chain ufw-not-local (1 references) 
target     prot opt source               destination          
RETURN     all  --  anywhere             anywhere             ADDRTYPE match dst-type LOCAL 
RETURN     all  --  anywhere             anywhere             ADDRTYPE match dst-type MULTICAST 
RETURN     all  --  anywhere             anywhere             ADDRTYPE match dst-type BROADCAST 
ufw-logging-deny  all  --  anywhere             anywhere             limit: avg 3/min burst 10 
DROP       all  --  anywhere             anywhere             

Chain ufw-reject-forward (1 references) 
target     prot opt source               destination          

Chain ufw-reject-input (1 references) 
target     prot opt source               destination          

Chain ufw-reject-output (1 references) 
target     prot opt source               destination          

Chain ufw-skip-to-policy-forward (0 references) 
target     prot opt source               destination          
DROP       all  --  anywhere             anywhere             

Chain ufw-skip-to-policy-input (7 references) 
target     prot opt source               destination          
DROP       all  --  anywhere             anywhere             

Chain ufw-skip-to-policy-output (0 references) 
target     prot opt source               destination          
DROP       all  --  anywhere             anywhere             

Chain ufw-track-input (1 references) 
target     prot opt source               destination          

Chain ufw-track-output (1 references) 
target     prot opt source               destination          

Chain ufw-user-forward (1 references) 
target     prot opt source               destination          

Chain ufw-user-input (1 references) 
target     prot opt source               destination          

Chain ufw-user-limit (0 references) 
target     prot opt source               destination          
LOG        all  --  anywhere             anywhere             limit: avg 3/min burst 5 LOG level warning prefix "[UFW LIMIT BLOCK] " 
REJECT     all  --  anywhere             anywhere             reject-with icmp-port-unreachable 

Chain ufw-user-limit-accept (0 references) 
target     prot opt source               destination          
ACCEPT     all  --  anywhere             anywhere             

Chain ufw-user-logging-forward (0 references) 
target     prot opt source               destination          

Chain ufw-user-logging-input (0 references) 
target     prot opt source               destination          

Chain ufw-user-logging-output (0 references) 
target     prot opt source               destination          

Chain ufw-user-output (1 references) 
target     prot opt source               destination    

nm-tool:

NetworkManager Tool 

State: disconnected 

- Device: wlan0 ---------------------------------------------------------------- 
  Type:              802.11 WiFi 
  Driver:            rt2800usb 
  State:             disconnected 
  Default:           no 
  HW Address:        6C:62:6D:23:D0:C0 

  Capabilities: 

  Wireless Properties 
    WEP Encryption:  yes 
    WPA Encryption:  yes 
    WPA2 Encryption: yes 

  Wireless Access Points  


- Device: eth0 ----------------------------------------------------------------- 
  Type:              Wired 
  Driver:            e1000e 
  State:             unavailable 
  Default:           no 
  HW Address:        00:22:4D:50:B3:9E 

  Capabilities: 
    Carrier Detect:  yes 

  Wired Properties 
    Carrier:         off 

    

Answer 1

Primeiro, verifique se o Network Manager não está gerenciando sua conexão, clique no applet de rede além do seu nome de usuário e verifique se "Ativar rede", "Com fio" e "Sem fio" estão ativos.

Além disso, parece que não há um conjunto de gateways, pode ser porque sua configuração de DHCP não está sendo capturada ou se você definiu manualmente sua configuração de rede. Se você definir sua configuração de rede Manual , deverá verificar se o gateway está preenchido ( você não precisa usar os mesmos valores da captura de tela, apenas veja quais valores devem ser preenchidos no caso de você usar o método manual ):

Se o seu método for Automático , tente desativar seu UFW.

Suas regras UFW estão descartando a maioria de seus pacotes, considere permitir todos os pacotes de saída ou pelo menos pacotes que portas de destino são desejadas, da sua pergunta você precisa permitir a saída para a porta TCP: 80 ( http) e entrada / saída UDP: 53 (DHCP). Você pode obter uma lista completa de portas em este artigo da Wikipédia . Se não tiver certeza, desative completamente as regras do UFW, verifique se você tem internet.

Você pode verificar quais pacotes estão sendo descartados fazendo um dmesg | grep UFW (pode ser uma lista bastante longa).