route.sh

#!/bin/sh
IPT=/sbin/iptables
LOCAL_IFACE=eth0
INET_IFACE=wlan0
INET_ADDRESS=192.168.21.231

# Flush the tables
$IPT -F INPUT
$IPT -F OUTPUT
$IPT -F FORWARD

$IPT -t nat -P PREROUTING ACCEPT
$IPT -t nat -P POSTROUTING ACCEPT
$IPT -t nat -P OUTPUT ACCEPT

# Allow forwarding packets:
$IPT -A FORWARD -p ALL -i $LOCAL_IFACE -j ACCEPT
$IPT -A FORWARD -i $INET_IFACE -m state --state NEW,ESTABLISHED,RELATED,INVALID -j ACCEPT

# Packet masquerading
# $IPT -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_ADDRESS
$IPT -t nat -A POSTROUTING -o $INET_IFACE -j MASQUERADE


route del default gw 192.168.9.1 dev eth0