just changed over to cable from dsl and now can't get my ubuntu 7.04 to run. I have a motorola sb5101i modem. Tryed 10.1.1.1 and found that doesn't work with this modem and have tryed doing searches on the modem but just get the motorola pages if anyone out there uses this modem could you please give me so help

Are you trying to use an assigned Ip address? Do you have a router between you and the modem? If you have no router then set the machine to use DHCP and let the modem assign the address it wants to use.

I just looked this modem up (thanks google).
The sb5101i modem seems to be a cable modem. It will not work with DSL. You need a DSL modem (with an ethernet connection please, not USB).

The OP does have cable now.

Part of the problem is that the modem may need to be registered before you can connect to the Internet. Usually you need to point your web browser to the modem, or your ISP's website, read the agreement and click "I Agree" on the bottom of the page.

Before you do this, after connecting the modem, be sure to power down everything for around 10 seconds.

Oops! Message to self: Don't post until after second cup of coffee!

Your cable provider will have a registration process which can frequently be done over the web. Some registration processes won't work with Linux so you may have to call support. Make note of the MAC address of the modem, they'll ask for that. Another potential point is that DSL may use pppoe which the cable probably won't use. You may need to disable pppoe.

yes it is a cable modem, I have just changed from dsl to cable and changed modem as well no I'm not running a router or an assigned address I have the modem running on another machine with windows fine just not ubuntu

Typically in the US DSL providers allow 3 dynamic IP address for the standard home service but most cable providers only allow one. The MAC of the PC or router is stored in volatile memory in the modem. Thus only one PC will be able to obtain an IP address and to connect to the internet. Since you have more then one PC you will need to obtain or configure one of your PCs as a router. If you recycle power to the modem it will forget the MAC and so you will be able to test the Ubuntu PC as long as the windows PC is disconnected.

BTW if the modem is not connected to the cable it does have a default local IP address for troubleshooting and status. Not sure what it is with this particular model. But this is the only way to talk to the unit directly that I know of.

Of course this assumes that the network adapter is setup and configured
on the Ubuntu computer.

ok but I'm in Australia and the modem instructions tell me you can run up to 32 computers off it for the internet My question is how do I setup ubuntu for cable and configure it??????????????

It sounds like your IP needs reset(I think someone mentioned that). Im not 100% sure how to do that, but I *think* sudo dhclient will redetect and reassign your IP address.

IGF

OK, I've had my coffee now.
I finally found a pdf describing your modem. It appears to be running a dhcp server, so, connect it up with the ethernet cable and try the following command in a terminal:
sudo ifdown eth0
sudo dhclient eth0
You should be connected.
Your modem's setup page should be accessible at http://192.168.100.1

You can also set things up with the GUI. System-> Administration-> Network. the line for wired connection should be checked with address dchp. You can select this line and click Properties to set Configuration to "Automatic configuration (DCHP)". With the DNS tab you can see what servers are set but you need not change them. The General and Hosts tab don't need to be changed by most users. There is also a line for Modem connection in the Connections tab but that is for dial up modems and not used for broadband. As stated in my prior post you will still need to have your ISP register the MAC address of your cable modem.

ok just tryed -sudo ifdown eth0 and got interface not configured


then tryed - sudo dhclient eth0 and got no working leases in persistent database

please explain what is going on???? I'm still learning!!!!

and I have set Automatic configuration (DCHP)

Did you try running just "sudo dhclient", w/o the etho? I just done that, and it appears to have worked fine for me(but I wasn't having any problems either..)

ok just tried running "sudo dhclient" and this is what I got

listening on lpf/eth0/00.04:23:1c:55:43
sending on lpf/eth0/00.04:23:1c:55:43
sending om fallback socket/fallback
dhcp discover on eth0 to 255.255.255.255 port interval 6
dhcp discover on eth0 to 255.255.255.255 port interval 11
dhcp discover on eth0 to 255.255.255.255 port interval 14
no dchp offers received
no working leases in persisent database - sleeping

ok what does this mean and what is going on??????????