> It depends on your router.  Usually routers have at least a GUI control panel 
> access and one of the pages shows recent attempts to connect and authenticate.

My router hasn't this!

> Are your running some sort of an access control list on the router and have 
> not included your MAC address?

The MAC adresses are included in the box.

> Try setting an address manually:
> 
>  ifconfig eth0 192.168.1.20 broadcast 192.168.1.255 netmask 255.255.255.0
> 
>  route add default gw 192.168.1.1 (assuming that this is your router) 

I put this in /etc/conf.d/net;  is it right?

> and then try to ping it:
> 
>  ping -c 3 192.168.1.1

The answer:

ping -c 3 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
From 192.168.1.20 icmp_seq=1 Destination Host Unreachable
From 192.168.1.20 icmp_seq=2 Destination Host Unreachable
From 192.168.1.20 icmp_seq=3 Destination Host Unreachable

--- 192.168.1.1 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 1999ms
pipe 3

Regards
Roger