Cannot connect to internet with Belkin router

[robhol]

I recently installed Ubuntu on my computer (as a dual-boot with Windows XP), and have been unable to connect to the internet. I am trying to connect with a Belkin router (I think it is F5D7633uk4A), as a wired connection. When it tries to connect it tries for about ten seconds and then says 'disconnected - you are now offline'. I can access the internet fine by booting into Windows, just not in Ubuntu. Also, I cannot access the router's configuration page (usually accessed by going to 192.168.2.1) in Ubuntu - I get a message saying it refused the connection. I can access it fine in Windows. I've tried everything I can think of to fix the problem, but since I'm a beginner to Linux I haven't made much progress. Can anyone help?

[MikeTbob]

Post the output of these commands please

sudo lspci |grep -i net

sudo ifconfig

sudo lsmod

[robhol]

sudo lspci |grep -i net:

00:11.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a2)
00:12.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a2)

sudo ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:1a:92:c0:cd:c3  
          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:247 Base address:0x2000 

eth1      Link encap:Ethernet  HWaddr 00:1a:92:c0:da:47  
          inet6 addr: fe80::21a:92ff:fec0:da47/64 Scope:Link
          UP BROADCAST RUNNING 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:1876 (1.8 KB)
          Interrupt:248 Base address:0xa000 

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:28 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2064 (2.0 KB)  TX bytes:2064 (2.0 KB)

sudo lsmod:

Module                  Size  Used by
isofs                  39844  1 
udf                    87716  0 
crc_itu_t              10112  1 udf
binfmt_misc            16776  1 
ppdev                  15620  0 
bridge                 56340  0 
stp                    10500  1 bridge
bnep                   20224  2 
input_polldev          11912  0 
video                  25360  0 
output                 11008  1 video
lp                     17156  0 
parport                42220  2 ppdev,lp
jedec_probe            20352  0 
cfi_probe              11520  0 
gen_probe              11264  2 jedec_probe,cfi_probe
cfi_util               13696  1 cfi_probe
psmouse                61972  0 
mtd                    23048  0 
pcspkr                 10496  0 
serio_raw              13316  0 
usblp                  20224  0 
chipreg                11012  2 jedec_probe,cfi_probe
usbhid                 42336  0 
i2c_nforce2            14980  0 
map_funcs               9984  0 
ohci1394               38576  0 
ieee1394               94660  1 ohci1394
forcedeth              61712  0 
fbcon                  46112  0 
tileblit               10752  1 fbcon
font                   16384  1 fbcon
bitblit                13824  1 fbcon
softcursor              9984  1 bitblit

[MikeTbob]

Do you have two of these cards?
I'm pretty sure they should be working, I see the correct module is loaded (Forcedeth), the output of ifconfig looks good. Are you using the network tool in the system tray? Did you tell the network tool you use DCHP and also to activate on boot?

[robhol]

Windows also shows me having two network cards, although only the second one is used to connect to the internet; the first one doesn't seem to do anything. The network tool I used was the one with the icon in the top right next to the clock (I think that is the system tray?) and I did set it the DCHP. I didn't see anything saying 'activate on boot' but I ticked 'connect automatically' (for both eth0 and eth1, though I think eth1 is the one I need), if that helps.

[elija]

I'm wondering if it is an IPv6 thing (http://www.linuxforums.org/forum/719236-post2.html)

Also try not connecting with eth0

[robhol]

When I click on the network manager icon, the only option to connect to is eth1. It doesn't seem as if it's even possible to connect to eth0. Also, I looked at that link and tried the instructions, but could not edit the disable_ipv6 file because I don't have permission. I guess maybe I need to log into the root user but I have no idea what the password is; it never asked me to set one for the root user when I installed Ubuntu.

[elija]

To run a command as root in Ubuntu you preface it with sudo

as in

sudo lsmod

The password it asks for is your own

[robhol]

I did use sudo but it just immediately said '/proc/sys/net/ipv6/conf/all/disable_ipv6: Permission denied' without even asking me for a password.

[robhol]

I have now managed to disable ipv6 using:

sudo su
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6

I have also checked the file and confirmed that it now says 1. However, this has not made any difference to the problem.

Edit: I found that if I set up a new wired connection in the network manager and set it as manual instead of DHCP, it will show up as 'connected', but I still can't access the internet and the router's configuration page still says 'connection refused' if I try to access it. However, I can ping 192.168.2.1 successfully, which I cannot do without using the manual connection.