Which model of Asus router? I can confirm it works fine with a HG612 and Asus rt-ac68u once you change the iptv settings in the routers web interface.
Think it's a RT N-56U but could be a 66U ,has Padavan firmware on it which means I can have my guest networks set up and DNS how I like it.
Not looked at IPTV settings in there but will check that soon.
Thanks.