It's a peer to peer VPN tunnel over UDP. You can specify multiple local ip if you have many gateway , and also can specify multiple remote ip . mptun can use all the possible paths for tunneling.
For example, if you have two internet connections , and you want to create one tunnel to your vps (it's very necessary in China :) over two of them , mptun can be helpful.
At server side (your VPS) that has public IPs (SERVERIP) :
mptun -i tun0 -p PORT -v 10.0.0.2 -t 10.0.0.1 -k SECRET
At client side :
mptun -i tun0 -p PORT -v 10.0.0.1 -t 10.0.0.2 -r SERVER_IP1 -r SERVER_IP2 -l LOCAL_IP1 -l LOCAL_IP2 -k SECRET
The local ips only for sending package out (can be none public IP). if you specify multiple local ip , that means multiple paths to server.
-k specify the secret for authentication, it's optional but must be the same between server and client.
The code is ugly, and just quick and dirty work for myself. It's not thoroughly tested, so of course there can be bugs. Any pull request is welcome, but don't ask me why the implementation is it :)
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