how to put it in conf?
or if im a node i don't need to do anything?
you are a node, but you can add other trusted nodes as well.
here is a good node: 207.12.89.2
Add it to your conf file like this (just add a line at the bottom, save and restart your daemon/walet):
addnode=207.12.89.2
I have someone in network security that may be able to help - i'll ask.