to ping another box on your lan you need to set the ip address for the same network.
I don't know your address but I will guess it's 192.168.0.1 netmask 255.255.255.0.
That means your network is 192.168.0
So if your other box is 192.168.0.2 netmask 255.255.255.0.
then you can set the linux box to 192.168.0.3 netmask 255.255.255.0.
do it like this
ifconfig eth0 192.168.0.3 netmask 255.255.255.0
that's all you need to do to ping the network
ping 192.168.0.1
or
ping 192.168.0.2