well, big answers for big questions... maybe we were a liitle bit offuscated =) today the sun shines =)
there, we have to write down the whole ip, start-ip and end-ip
for example, the range isn't 50-100, the proper range should be 192.168.0.50-192.168.0.100
the field blocks news characters from the third, TILL you enter a dot!!! That confused us.