Você se esqueceu de NAT wlan0:
$ iptables -A FORWARD -i wlan0 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
$ iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT
$ iptables -t nat -A POSTROUTING -s 22.150.16.0/24 -o eth0 -j MASQUERADE
$ iptables-save > /etc/sysconfig/iptables