Its the WAN IP of course.   cmon guys  give me a break,  Ive been using  DC++ in one form or another for several years, this isn't the first time I've set it up.  and I have it running on two computers  simultaneously. 
 
I just went in  and put this pc  in the DMZ on the router, which I really hate to do,  but it worked.  Search function works perfectly now. 
 
  
 
 
KK   I made it to the hub,   will keep checking for ya.