turn your linux as router

to forward Internet request from network socket rj45 (eth0)  to wireless card (wlan0) :


su
echo 1 > /proc/sys/net/ipv4/ip_forward
/sbin/iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
/sbin/iptables -A FORWARD -i wlan0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT



done. u might need to manually configure ip address for eth0:
sudo ifconfig eth0 192.168.0.1 netmask 255.255.255.0