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Install Ubuntu 11.04 Server Edition on your netbook/old pc/thin client etc.. with default settings.

Step 2

sudo apt-get install isc-dhcp-server hostapd

Step 3

sudo pico /etc/hostapd/hostapd.conf

interface=wlan0	driver=nl80211	ssid=UbuntuAP	hw_mode=g	channel=11	wpa=1	wpa_passphrase=UbuntuAPPassPhrase	wpa_key_mgmt=WPA-PSK	wpa_pairwise=TKIP CCMP	wpa_ptk_rekey=600

Step 4

sudo pico /etc/dhcp/dhcpd.conf

default-lease-time 600;max-lease-time 7200;option subnet-mask 255.255.255.0;option broadcast-address 10.20.30.255;option domain-name "mydomain.example";subnet 10.20.30.0 netmask 255.255.255.0 {        range 10.20.30.10 10.20.30.50;        option domain-name-servers 8.8.4.4, 208.67.222.222;        option routers 10.20.30.254;}

Step 5

sudo pico /etc/default/isc-dhcp-server

INTERFACES="wlan0"

Step 6

Enable IP Routing and save the IPtable rules.

sudo bash	echo "1" > /proc/sys/net/ipv4/ip_forward	iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE	iptables-save > /etc/iptables.rules

Step 7

Assign static IP to Wireless adapter and auto load IPtable rules

sudo pico /etc/network/interfaces

auto wlan0iface wlan0 inet static address 10.20.30.254 netmask 255.255.255.0pre-up iptables-restore < /etc/iptables.rules

Step 8

Auto start DHCP Server and hostapd (AccessPoint)

sudo pico /etc/rc.local

service isc-dhcp-server starthostapd -dd /etc/hostapd/hostapd.conf

Reference

• https://exain.wordpress.com/tag/rt2800usb/
• https://help.ubuntu.com/community/IptablesHowTo

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我自己的脚本[ArchLinux]：

vpn-connectiptables -A FORWARD -s 10.42.0.0/24 -o ppp0 -j ACCEPTiptables -t nat -A POSTROUTING -s 10.42.0.0/24 -o ppp0 -j MASQUERADEecho 1 >/proc/sys/net/ipv4/ip_forwardip addr add 10.42.0.0/24 dev wlan0ip route add default via 10.42.0.1rc.d start dhcp4hostapd -B /etc/hostapd/hostapd.conf

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