Asus Padadavan - Run the Script After Connected/Disconnected to VPN Server:

ovpn_client_upscript.sh

#!/bin/sh

### Custom user script
### Called after internal VPN client connected/disconnected to remote VPN server
### $1        - action (up/down)
### $IFNAME   - tunnel interface name (e.g. ppp5 or tun0)
### $IPLOCAL  - tunnel local IP address
### $IPREMOTE - tunnel remote IP address
### $DNS1     - peer DNS1
### $DNS2     - peer DNS2

IPSTART="192.168.0.200"
IPEND="192.168.0.205"

#
ip route flush table 10
ip route del default table 10
ip rule del fwmark 10 table 10
ip route flush table 12
ip route del default table 12
ip rule del fwmark 12 table 12
ip route flush cache
iptables -t mangle -F PREROUTING

tun_if=$IFNAME
tun_ip=$IPLOCAL

ip route add default via $tun_ip dev $tun_if table 10
ip rule add fwmark 10 table 10
ip route add default via $(nvram get wan_gateway) dev eth2 table 12
ip rule add fwmark 12 table 12

echo 0 > /proc/sys/net/ipv4/conf/$tun_if/rp_filter

iptables -t mangle -A PREROUTING -i br0 -m iprange --src-range $IPSTART-$IPEND -j MARK --set-mark 10
iptables -t mangle -A PREROUTING -i br0 -p tcp --dport 563 -j MARK --set-mark 12

exit