Ubuntu

Problem trying to conect Internet with motorola cable modem

Asked by kenardrs on 2008-10-26

I'm having problems to connect internet by cable modem, sometimes it works fine by it self (with no changes in linux), but sometimes it just stop to work. Folow some commands i have used trying to solve the problem with no sucess, it also gives you some information to help me to solve it.

1 - RESULT OF THE CMD "ping" ON THE MODEM (GATEWAY) IP;
kike@kikeG00:~$ ping 192.168.100.1
connect: Network is unreachable

2 - SHUTDOWN INTERFACE;

kike@kikeG00:~$ sudo ifdown eth0
There is already a pid file /var/run/dhclient.eth0.pid with pid 6019
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:0e:a6:a6:f0:16
Sending on LPF/eth0/00:0e:a6:a6:f0:16
Sending on Socket/fallback
DHCPRELEASE on eth0 to 200.167.216.15 port 67
send_packet: Network is unreachable
send_packet: please consult README file regarding broadcast address.

3 - STARTING UP INTERFACE;

kike@kikeG00:~$ sudo ifup eth0
There is already a pid file /var/run/dhclient.eth0.pid with pid 134519072
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:0e:a6:a6:f0:16
Sending on LPF/eth0/00:0e:a6:a6:f0:16
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9
DHCPOFFER of 189.61.122.55 from 10.208.64.1
DHCPREQUEST of 189.61.122.55 on eth0 to 255.255.255.255 port 67
DHCPACK of 189.61.122.55 from 10.208.64.1
SIOCADDRT: No such process
bound to 189.61.122.55 -- renewal in 4618 seconds.

4 - RESULT OF THE CMD "netstat -r";

kike@kikeG00:~$ netstat -r
Tabela de Roteamento IP do Kernel
Destino Roteador MÃ¡scaraGen. OpÃ§Ãµes MSS Janela irtt Iface
189.61.112.0 * 255.255.240.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 0 0 0 eth0

5 - RESULT OF THE CMD "ifconfig -a";

kike@kikeG00:~$ ifconfig -a
eth0 Link encap:Ethernet EndereÃ§o de HW 00:0e:a6:a6:f0:16
          inet end.: 189.61.122.55 Bcast:255.255.255.255 Masc:255.255.240.0
          endereÃ§o inet6: fe80::20e:a6ff:fea6:f016/64 Escopo:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 MÃ©trica:1
          pacotes RX:3566 erros:0 descartados:0 excesso:0 quadro:0
          Pacotes TX:24 erros:0 descartados:0 excesso:0 portadora:0
          colisÃµes:0 txqueuelen:1000
          RX bytes:238946 (233.3 KB) TX bytes:4498 (4.3 KB)
          IRQ:21

lo Link encap:Loopback Local
          inet end.: 127.0.0.1 Masc:255.0.0.0
          endereÃ§o inet6: ::1/128 Escopo:MÃ¡quina
          UP LOOPBACK RUNNING MTU:16436 MÃ©trica:1
          pacotes RX:1198 erros:0 descartados:0 excesso:0 quadro:0
          Pacotes TX:1198 erros:0 descartados:0 excesso:0 portadora:0
          colisÃµes:0 txqueuelen:0
          RX bytes:59900 (58.4 KB) TX bytes:59900 (58.4 KB)

6 - STILL WITH NO INTERNET CONNECTION ( SHUTDOWN INTERFACE eth0 AGAIN );

kike@kikeG00:~$ sudo ifdown eth0
There is already a pid file /var/run/dhclient.eth0.pid with pid 7849
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

7 - RE-STARTING NETWORK;

kike@kikeG00:~$ sudo /etc/init.d/networking start
* Configuring network interfaces... There is already a pid file /var/run/dhclient.eth0.pid with pid 134519072
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:0e:a6:a6:f0:16
Sending on LPF/eth0/00:0e:a6:a6:f0:16
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPOFFER of 189.61.122.55 from 189.61.96.1
DHCPREQUEST of 189.61.122.55 on eth0 to 255.255.255.255 port 67
DHCPACK of 189.61.122.55 from 189.61.96.1
SIOCADDRT: No such process
bound to 189.61.122.55 -- renewal in 5351 seconds.
[ OK ]