route all traffic doesn't work

Question

I wanna to route all traffic by DNS.it worked before by following command ,but it doesn't work today for unknown reason.

before connecting to iodine:

# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         edimax.com      0.0.0.0         UG    0      0        0 wlan0
link-local      *               255.255.0.0     U     1000   0        0 wlan0
192.168.2.0     *               255.255.255.0   U     2      0        0 wlan0

after connecting:

# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         edimax.com      0.0.0.0         UG    0      0        0 wlan0
10.0.0.0        *               255.255.255.224 U     0      0        0 dns0
link-local      *               255.255.0.0     U     1000   0        0 wlan0
192.168.2.0     *               255.255.255.0   U     2      0        0 wlan0

command to route data over DNS Tunnle:

#!/bin/bash
sudo route del default gw 192.168.2.1 wlan0
sudo route add default gw 10.0.0.1 dns0
sudo route add -net 209.54.48.51 netmask 255.255.255.255 gw 192.168.2.1 wlan0