i found a solution already for dlink dir 816l b1 it is a sdk version it has alot of function like print server ,torrent ,samba,file sharing and much more option like repeater mode vlan tagging for those who want try it get it here ftp://ftp.dlink.ru/pub/Router/DIR-816L/Fi..._sdk-master.bin
i think u need to set the ethernet on port 4 and assign vlan 600 to it and enable igmp

by the way  try to use this  DIR-850L firmware below it has more advance function but its not official yet