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August 2nd, 2011, 07:29 PM
In ubuntu 10.04 LTS I am currently unable to access the location I have accessed it earlier. This is necessary for modem configuration. I am at a loss why this is inaccessible at present. Can anybody please advise what to do? I am configuring firewall but I doubt if that has anything to do with my problem. Or in case this may be due to faulty firewall configuration, please indicate denial of possible service/program which may cause this. Also ping reports 100% packet loss. What do I conclude?

August 2nd, 2011, 10:19 PM
Hi, it might should be

August 3rd, 2011, 03:00 AM
From a terminal (Applications>Accessories>Terminal), you can use ifconfig -a to see what IP address the computer has. The modem should be in the same subnet.

Alternately, System>Administration>Network Tools can be used to check the IP address of your interface (eth0?)

August 3rd, 2011, 04:38 AM
Thanks for your attention.
Here is the result of ifcinfig -a.

************************************************** *************
eth0 Link encap:Ethernet HWaddr 00:21:85:91:5a:43
inet6 addr: fe80::221:85ff:fe91:5a43/64 Scope:Link
RX packets:6861 errors:0 dropped:0 overruns:0 frame:0
TX packets:1783 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2463370 (2.4 MB) TX bytes:309412 (309.4 KB)
Interrupt:25 Base address:0x2000

lo Link encap:Local Loopback
inet addr: Mask:
inet6 addr: ::1/128 Scope:Host
RX packets:102 errors:0 dropped:0 overruns:0 frame:0
TX packets:102 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:14961 (14.9 KB) TX bytes:14961 (14.9 KB)

ppp0 Link encap:Point-to-Point Protocol
inet addr: P-t-P: Mask:
RX packets:6775 errors:0 dropped:0 overruns:0 frame:0
TX packets:1697 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:2307916 (2.3 MB) TX bytes:269372 (269.3 KB)

************************************************** *********
I have tried to load all of these one by one but failed:,,,,

So the problem remains.

August 3rd, 2011, 04:48 AM
I don't see an IPV4 address in there.

That first set should have an inet addr entry like you see in the second (Local Loopback )

Only suggestion I can think of is to manually set an IP of with a subnet of or reset your router (wihch I assume is what's handing out your address), but this would also reset any changes you made at that router.

August 3rd, 2011, 07:35 AM
How do you connect to internet ? Using network manager DSL connection or running pon command in terminal?
If you are using network manager, disconnect DSL connection first , connect eth0 and try again.If there is no luck please run
sudo dhclient eth0and retry.

August 3rd, 2011, 12:38 PM
Thanks. The sudo command really solved the problem. Here is the report of the sudo dhclient eth0 command:
Listening on LPF/eth0/00:21:85:91:5a:43
Sending on LPF/eth0/00:21:85:91:5a:43
Sending on Socket/fallback
DHCPDISCOVER on eth0 to port 67 interval 6
DHCPREQUEST of on eth0 to port 67
DHCPACK of from
bound to -- renewal in 34206 seconds.
************************************************** *
Though surprisingly just after running the command, I was able to connect to, I was unable to access Internet. After I restarted modem, I was able to access both. Can anybody please check if the above statements are Ok or not. (I am yet to learn these issues.)

Regarding the question, how I connect to net: I run the command sudo pon dsl-provider in terminal. I am not sure why you asked but this info may help you. By the way, I use BSNL broadband and I used these commands when I configured modem:

sudo ifconfig eth0 netmask up
sudo route add default gw eth0
sudo pppoeconf

Then followed the instructions appeared. Did I do things right or was there any problem?
Thanks a lot to everybody for your attention to my problem.

August 3rd, 2011, 05:47 PM
I think he was just asking if your modem was setup as a bridge or something else. How you connect pretty much tells everyone what your modem is supposed to do. I don't think I've ever had a need myself to use either pon or pppoeconf, but I know there's situations that require it..and admittedly, these things get over-thought a lot too.

I think you're good with what you did. I expect the output from ifconfig now to show

eth0 Link encap:Ethernet HWaddr 00:21:85:91:5a:43
inet addr: Bcast: Mask:

and setting the gateway like you did (to is telling your PC where to go look for the internet.

I assume you're still seeing the internet and able to hit

August 4th, 2011, 07:09 AM
I think he was just asking if your modem was setup as a bridge or something elseFurball588 is right.
You can configure your modem in bridge mode or PPPoE mode.If your modem is in bridge mode you need to create a pppoe connection in your PC to connect/disconnect broadband.There are two methods
1)The terminal method
Run sudo pppoeconf command to create the connection.Then connect using pon dsl-provider (disconnect using poff dsl-provider)
2)GUI method(At present your modem is in bridge mode and you are using terminal method to connect/disconnect but I suggest you try this)
If you want to access your modem,disconnect dsl connection then connect eth0 and proceed(Ensure this:click network manager icon on right top of the panel-edit connections-select eth under wired tab-edit-ipv4 settings-method=Automatic DHCP and apply.
If your modem is in PPPoE mode the internet connection will be always ON.Also you can access modem directly via firefox.Configuring different modems in PPPoE mode is explained here (http://ernakulam.sancharnet.in/ernakulam/bbservice.html) under CPE/modem config