There is generally nothing you can do to mitigate a DDOS attack other than play nice with others. Anything YOU do is too late, your limited bandwidth has already been used. You can do a VPN which will throw off your actual IP address. But if the attacker somehow gets your true IP address, there is nothing you can do.
I don't understand the first part or your post. What about "2 dual dishes" ? A "Bridge setup" for what?