Internet not working. Please help

[gth]

I have got Dual boot of Windows & Ubuntu on my PC.
Internet work fine on windows. However, unable to access any website or get updates on Linux. In ubuntu, the icon for network connection shows are 'wired connected' using eth0.

I have read some post here & tried out some commands on console.


:~$ lspci | grep -i ethernet
02:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)



:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 07:60:24:9f:91:79
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::280:28f:fe8f:7145e/54 Scope:Link

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host


:~$ dmesg | grep eth
[ 2.078432] eth0: RealTek RTL8139 at 0x2000, 070:47:24:4f:71:7e, IRQ 14
[ 12.617946] eth0: link up, 100Mbps, full-duplex, lpa 0x44E1
[ 22.756068] eth0: no IPv6 routers present

:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback


:~$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.1.1



Pl. help resolve issue.

[nujinini]

Hello and welcome gth!

Can you please post the output of

lsmod

Thanks!

[gth]

:~$ lsmod
Module                  Size  Used by
cbc                     3516  72 
aes_i586                8124  73 
aes_generic            27484  1 aes_i586
ecb                     2524  1 
binfmt_misc             8356  1 
snd_es1938             18532  3 
gameport               11368  2 snd_es1938
snd_pcm_oss            37920  0 
snd_mixer_oss          16028  1 snd_pcm_oss
snd_pcm                75296  2 snd_es1938,snd_pcm_oss
snd_page_alloc          9156  1 snd_pcm
snd_opl3_lib           10396  1 snd_es1938
snd_hwdep               7200  1 snd_opl3_lib
snd_mpu401_uart         6940  1 snd_es1938
snd_seq_dummy           2656  0 
snd_seq_oss            28576  0 
snd_seq_midi            6432  0 
snd_rawmidi            22208  2 snd_mpu401_uart,snd_seq_midi
snd_seq_midi_event      6940  2 snd_seq_oss,snd_seq_midi
snd_seq                50224  6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
dm_crypt               12928  0 
iptable_filter          3100  0 
snd_timer              22276  4 snd_pcm,snd_opl3_lib,snd_seq
snd_seq_device          6920  6 snd_opl3_lib,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
lp                      8964  0 
ppdev                   6688  0 
ip_tables              11692  1 iptable_filter
snd                    59204  17 snd_es1938,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_opl3_lib,snd_hwdep,snd_mpu401_uart,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
x_tables               16544  1 ip_tables
psmouse                56180  0 
serio_raw               5280  0 
soundcore               7264  1 snd
parport_pc             31940  1 
shpchp                 32272  0 
parport                35340  3 lp,ppdev,parport_pc
fbcon                  36640  72 
tileblit                2460  1 fbcon
font                    8124  1 fbcon
bitblit                 5372  1 fbcon
softcursor              1756  1 bitblit
8139too                22620  0 
8139cp                 19260  0 
mii                     5212  2 8139too,8139cp
floppy                 54916  0 
i915                  221064  2 
drm                   159584  2 i915
i2c_algo_bit            5760  1 i915
intel_agp              27484  2 i915
agpgart                34988  2 drm,intel_agp
video                  19380  1 i915
output                  2780  1 video

[Rubberman]

You probably don't have a proper DNS server entry in /etc/resolv.conf. Post the output of that file here. Your ethernet is working, otherwise you would not have an IP address (192.168.1.2). The other possibility is that the gateway address is not correct (the address of your router).

[hatebreed]

you should try ifconfig eth0 down, then ifconfig eth0 up and see if gets the proper ip. the routers i've seen assign 192.168.2. something for your ip. see if you can log into your router through your browser and check out what it's setting up for ips as far as 192.168.2. whatever through 192.168.2. whatever. this will tell you if your at least getting the proper ip or not and you can also check out your gateway and dns there also.

[gth]

Content of /etc/resolv.conf

# Generated by NetworkManager
nameserver 192.168.1.1

Also,

ifconfig eth0 down

ifconfig eth0 up

did not solve the problem.

[rcgreen]

It looks as if your router is assigning an IP address to the computer
and setting the router address as the name server. This is the
way many routers work, so it doesn't look unusual.

Try looking up an address like

rcgreen@blue:~$ nslookup google.com
Server:		68.87.73.246
Address:	68.87.73.246#53

Non-authoritative answer:
Name:	google.com
Address: 72.14.204.147
Name:	google.com
Address: 72.14.204.99
Name:	google.com
Address: 72.14.204.104
Name:	google.com
Address: 72.14.204.103

If you get no address, try logging on to the router
by putting its address in the address bar of your web browser.

192.168.1.1

This is the configuration page. It will reveal useful stuff,
like the ISPs gateway and name servers. As a workaround
you could add one of their name servers to /etc/resolv.conf
but it will reset to the default when you reboot. First, see if this
is the issue.

[gth]

:~$ nslookup ***.google.com
Server:		192.168.1.1
Address:	192.168.1.1#53

Non-authoritative answer:
***.google.com	canonical name = ***.l.google.com.
Name:	***.l.google.com
Address: 209.85.153.104

ps: *** = www

[Rubberman]

Actually, resolv.conf will not get reset automatically at reboot, but some operations will modify it, such as if you connect thru a VPN. In any case, add these entries to the top of your /etc/resolv.conf and try to access the internet again:

nameserver 199.45.32.37
nameserver 199.45.32.40

One last possibility is if you have installed/enabled SELinux extensions and haven't set it up properly, you might not be allowed internet access by the security system.

[hatebreed]

I still think the first thing you should do is log into your router and make sure your getting the proper info. this is the heart of your network and the first spot you should look when in your stumped. If everything looks good there you know that part is good and you can work on your system. Another reason you should start there is sometimes your router will give you the ip and dns and gateway but your router isn't getting the ip from you isp correctly. So you may have an ip on your system but your router doesn't have it's ip and you won't have internet access.