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I would like to direct all the traffic through my VPN connection on my Android based phone (HTC Desire). The VPN works great, but problem is that when the VPN disconnects, the traffic is redirected through my regular internet, something I don't want to happen. How can I block the traffic outside the VPN?

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using Tasker(app), I can put the phone into flight mode when an event occurs, in this case a message notification at the top bar. This does occur when the VPN disconnects, however the program can't distinguish that from any other message. What I need is a standalone app that would pop a message when the VPN disconnects. Do you know any? – Betty Kantor Oct 11 '11 at 18:17
Flight mode also disables the cell radio, are you sure that you wish to disable calling features too when disconnected from the VPN? – onik Oct 11 '11 at 20:29

You could use DroidWall for this IF you're rooted. Just deny all traffic and then allow traffic to your VPN IP/port. If you need to use a custom script see the man page of iptables for the syntax. Here's a quick, untested example.

iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -A OUTPUT -p udp --dport 1194 -d -j ACCEPT
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