Routing thru a new network card

[compdoc]

> ifconfig eth1 192.168.100.3 netmask 255.255.255.0
>
> now I want to route every internet traffic to eth1, or at least trafic 
> to
> 177.67.81.98
>
> so I did:
>
> route add 177.67.81.98 dev eth1

I don't think that's going to work. Basically, you have added a route
telling your pc how to reach the network "177.67.81.x", but the internet has
many more addresses than that.

You need to send all non-local (internet) traffic to a certain router, known
as the default gateway. Your system can only have one such gateway
configured. 

So, you have to delete the existing gateway address from eth0, and add a new
one to the eth1 card. The gateway address will be the local address for the
cable modem, which is likely something like 192.168.100.1

Searching Google I found the following site, but it's certainly not the only
one:

http://www.cyberciti.biz/faq/howto-debian-ubutnu-set-default-gateway-ipaddre
ss/