I recently got an USB Cable modem. Everything is working fine with it, my kernel is supporting it... except one little problem.

I have a network card (realtek 8139, working very fine habitually) with a fix ip adress (192.168.0.1) I'm using for my local network.
Strangely, when my system get the adress from my ISP (using my USB cable modem) it assigns it to my network card. It also change my hostname.
But the USB modem has business to do with my network card.

So I can't use my network and internet at the same time. It there a way to force linux to does not assign the ip I get from my ISP dhcp to the network card or to assign it to another (virtual?) network card?

You may need to setup routing software so that your network or LAN is seperate from the internet or WAN (wide area network).

What do you mean by "routing software"?

IPchains, IPtables, or something similar or better.

Example of routing instructions
http://www.justlinux.com/nhf/Networks/Routing.html

You may have a hard time configuring the cable modem.

You can always get a router and connect the cable modem to it. Then your whole network has access to the internet with out any problems.

Thank you I will take a look. It seems really hard
It's not possible to just create a virtual card to receive DHCP adress?

I have that problem too any ideas?

I have 1 NIC (RTL8139) and a USB cable modem.
If I unplug my usb cable modem, my nic is eth0 with a fixed ip address (192.169.0.1) and everythings working fine, but if I plug my usb cable modem, my eth0 is still my NIC with 192.168.0.1 and has the MAC address of my cable modem.

It seems that my usb cable modem try to assign eth0 as my cable modem...

If i go to system preferences, network (GUI), it tells me that the alias of eth0 in my modules.conf is 8139too (my NIC) and the module that is currently loaded is CDCEther (my usb cable modem)...

Anyone knows how to solve my problem?

I would greatly appreciate because I had this problem for the last 4 months...

Thanks

Okay I tried something.

I unpluged my USB Cable modem and I booted my Linux.
My NIC was detect as eth0 with 192.168.0.1.
After Linux has booted I have plugged my USB Cable modem and I have add eth1 and I type ifconfig eth1 up and my USB Cable modem was eth1!!!
Everything was working fine!!!

But the only problem is that when I have rebooted my problem was still there... When it was booting, it says mounting eth0 (OK) and mounting eth1 (FAILED). No device blah blah... That means the problem is when Linux is booting because I got my eth0 and eth1 working at the same time when it was already booted...

Anyone can help me plz??