Black list is not working, or I dont know how to use it...If I set blacklist and then discover, nothing is dicovered...

Also, when discovering, some devices are discovered, despite they are not there...Simple example in subnet 192.168.254.0/30 it detects 2 routers (192.168.254.1 and 192.168.254.2) and also 10.168.254.2 witch is not supposed to be there. This happend when one of the routers is Freebsd or any other linux router...