share internet connection in linux via terminal

On access point side

1. disable firewall
2. enable packet forwarding
   # echo 1 > /proc/sys/net/ipv4/ip_forward
3. set iptables rule for port forwarding
   # iptables -t nat -A POSTROUTING -o -j MASQUERADE

on client side:

1. configure network interface so you can reach the access point
2. set the access point as default gateway
   # route add default gw
3. set dns resolution
   # echo nameserver 8.8.8.8 >> /etc/resolv.conf