cat /etc/iproute2/rt_tables

ip route list table wan1

dmesg | grep usb
dmesg | grep USB

ifconfig eth3 up

touch /jffs/scripts/udh.sh
chmod +x /jffs/scripts/udh.sh
nano /jffs/scripts/udh.sh

#!/bin/sh
 
#set route table for second wan
TABLE="wan1"
 
[ -n "$1" ] || { echo "Error: should be called from udhcpc"; exit 1; }
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
 
IFS=. read -r i1 i2 i3 i4 <<EOF
$ip
EOF
IFS=. read -r m1 m2 m3 m4 <<EOF
$subnet
EOF
SUBIP=$(printf "%d.%d.%d.%d" "$((i1 & m1))" "$((i2 & m2))" "$((i3 & m3))" "$((i4 & m4))")
 
lip=`ip addr show br0 | grep -o "inet [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" | grep -o "[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*"`
lsubnet=`ifconfig br0 | grep Mask | cut -d":" -f4`
IFS=. read -r i1 i2 i3 i4 <<EOF
$lip
EOF
IFS=. read -r m1 m2 m3 m4 <<EOF
$lsubnet
EOF
LOCSUBIP=$(printf "%d.%d.%d.%d" "$((i1 & m1))" "$((i2 & m2))" "$((i3 & m3))" "$((i4 & m4))")
 
 
mask2cidr() {
    nbits=0
    IFS=.
    for dec in $1 ; do
case $dec in
    255) let nbits+=8;;
    254) let nbits+=7;;
    252) let nbits+=6;;
    248) let nbits+=5;;
    240) let nbits+=4;;
    224) let nbits+=3;;
    192) let nbits+=2;;
    128) let nbits+=1;;
    0);;
    *) echo "Error: $dec is not recognised"; exit 1
    esac
    done
    printf "$nbits"
}
CIDR=$(mask2cidr $subnet)
 
case "$1" in
    deconfig)
        echo "Clear existing config"
        ifconfig $interface 0.0.0.0
        ip addr flush dev $interface
    ;;
    renew|bound)
        echo "Setting interface IP $interface $ip $BROADCAST $NETMASK"
        #ip addr add $ip/$CIDR broadcast $BROADCAST dev $interface
        ifconfig $interface $ip $BROADCAST $NETMASK
 
        echo "Route adding for $SUBIP/$CIDR"
		#route in table
		ip route add $SUBIP/$CIDR dev $interface table $TABLE
		#LAN br0
		ip route add $LOCSUBIP/$CIDR dev br0 table $TABLE
		#route in default
		ip route add $SUBIP/$CIDR dev $interface
		#route localhost
		ip route add 127.0.0.0/8 dev lo table $TABLE
 
 
        echo "Setting default gateway"
        if [ -n "$router" ] ; then
            echo "Deleting routers"
            while ip route del default dev $interface table $TABLE  ; do
                :
            done
 
            while ip route del default dev $interface ; do
                :
            done
 
            metric=0
            for i in $router ; do
                echo "Adding gateway $i"
				ip route add $i dev $interface metric $metric table $TABLE
				ip route add default via $i dev $interface metric $metric table $TABLE
				ip route add $i dev $interface metric $metric
                : $(( metric += 1 ))
            done
        fi
        #from and to
        echo "IP Rule"
		ip rule add from $SUBIP/$CIDR lookup $TABLE
		ip rule add from all to $SUBIP/$CIDR lookup $TABLE
 
        #set firewall
        echo "Firewall set"
		iptables -t nat -A POSTROUTING ! -s $SUBIP/$CIDR -o $interface -j MASQUERADE
    ;;
esac
 
exit 0

udhcpc -i eth3 -s /jffs/scripts/udh.sh

nano /jffs/scripts/post-mount

ifconfig eth3 up
ifconfig eth3 0.0.0.0
ifconfig eth3 192.168.8.100 192.168.8.255 255.255.255.0
ip route add 192.168.0/24 dev eth3 src 192.168.8.100 table wan1
ip route add 192.168.0/24 dev eth3
ip route del default dev eth3 table wan1
ip route del default dev eth3
ip route add default via 192.168.8.1 dev eth3 metric 0 table wan1
ip rule add from 192.168.8.100/32 table wan1
ip rule add to 192.168.8.100/32 table wan1
iptables -t nat -A POSTROUTING -o eth3 -j MASQUERADE

iptables -t nat -vL
iptables -vL

RESOLV_CONF="/etc/resolv.conf"
echo "Recreating $RESOLV_CONF"
# If the file is a symlink somewhere (like /etc/resolv.conf
# pointing to /run/resolv.conf), make sure things work.
realconf=$(readlink -f "$RESOLV_CONF" 2>/dev/null || echo "$RESOLV_CONF")
tmpfile="$realconf-$$"
> "$tmpfile"
[ -n "$domain" ] && echo "search $domain" >> "$tmpfile"
for i in $dns ; do
	echo " Adding DNS server $i"
	echo "nameserver $i" >> "$tmpfile"
done
mv "$tmpfile" "$realconf"

ip route change default via 192.168.8.1 dev eth3 metric 0