----  
opkg install kmod-usb-uhci kmod-usb-storage block-mount block-hotplug kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1

tar -C /overlay -cvf - . | tar -C /mnt/sda1 -xf -
 The following is an example for an extroot fstab mount entry for pivot overlay. Note the fstype, options and enable_fchk options are optional, see fstab.

config mount 
    option target /overlay 
    option device /dev/sda1 
    option fstype vfat 
    option options rw,sync 
    option enabled 1 
    option enabled_fsck 0

http://wiki.hidemyass.com/OpenWRT_OpenVPN_Setup


root@OpenWrt:/etc/config# cat network

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config interface 'lan'
        option ifname 'eth0'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.0.254'
        option netmask '255.255.255.0'
        option gateway '192.168.0.1'
        list dns '192.168.0.1'
        list dns '8.8.8.8'

root@OpenWrt:/etc/config# cat wireless
config wifi-device  radio0
        option type     mac80211
        option channel  11
        option macaddr  14:cf:92:a0:fb:d6
        option hwmode   11ng
        option htmode   HT20
        list ht_capab   SHORT-GI-20
        list ht_capab   SHORT-GI-40
        list ht_capab   RX-STBC1
        list ht_capab   DSSS_CCK-40
        # REMOVE THIS LINE TO ENABLE WIFI:
        option disabled 0

config wifi-iface
        option device   radio0
        option network  lan
        option mode     ap
        option ssid     OpenWrt
        option encryption none


#!/bin/sh
packages="kmod-fs-ext4 kmod-usb-storage block-mount"
dev=sda2
swapdev=sda1
fstype=ext4
options=rw,sync,noatime

enable()
{
echo "Stopping automounting"
/etc/init.d/fstab stop

opkg update
opkg install $packages

sleep 10

while [ ! -b /dev/$dev ] ; do
echo "/dev/$dev not found please insert the USB storage device"
read junk
done

mkdir -p /mnt/$dev
mount /dev/$dev /mnt/$dev -t $fstype -o $options

tar -C /overlay -cvf - . | tar -C /mnt/$dev -xf -

uci add fstab mount
uci set fstab.@mount[-1].device=/dev/sda2
uci set fstab.@mount[-1].options=$options
uci set fstab.@mount[-1].enabled_fsck=0
uci set fstab.@mount[-1].enabled=1
uci set fstab.@mount[-1].target=/overlay
uci set fstab.@mount[-1].fstype=$fstype

uci add fstab swap
uci set fstab.@swap[-1].device=/dev/sda1
uci set fstab.@swap[-1].enabled=1

uci commit fstab

/etc/init.d/fstab enable

echo "Overlay enabled, you need to reboot to activate it"
}

enable


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openwrt pptp
http://bluemarmot.ekibox.net/en/node/71