client <--> suft-client  <--> suft-server  <--> server
    tcp <-> udp                        udp <-> tcp

server:
go get github.com/messyidea/sufttun/server

server -l "addr:port" -t "addr:port" -b 10 --key "your key" --tuncrypt true

-l: local addr
-t: target addr
-b: max bandwidth of sending in mbps
--key: your key
--tuncrypt: encrypt


client:
go get github.com/messyidea/sufttun/client

client -l "addr:port" -r "addr:port" -b 10 --key "your key" --tuncrypt true

-l: local addr
-r: remote addr
-b: max bandwidth of sending in mbps
--key: your key
--tuncrypt: encrypt

server -l ":porta" -t "127.0.0.1:portb" -b 10 --key "yourkey" --tuncrypt true
client -l ":portc" -r "server:portd" -b 10 --key "yourkey" --tuncrypt true