you cant DDOS a hamachi server
you can DOS a hamachi server ,but i do not think that some people will do that
a proxy does not work on hamachi as hamachi is a VPN ( just like a proxy does )
so the setup to do a DDOS on a VPN is complicated (or you can start routing a lot of proxy's to the vpn and so on ... to mutch tech talk and complicated to explain )
eather way
IF they even try to ddos a hamachi server , then you woulnd even notice it
as most service providers block incoming traffic ( ISP's ) and certain ports unlike webhosts
and even if they dit , depending on your speed/provider you woulnd even notice it
or they do like trigger does , get a vps and put his overpowered program on it to press a button after he put hamachi on it and hoping it will route true the vpn system of hamachi network
anyway
it is not something you need to be affraid of
its the same that trigger feels like god when he get blocked in my firewall and want to show proof to the world that my site is down for him (he even thinks that my sites are on a vps ... he forgot i am a webhost in first place xD )
Greets From PowerChaos