Looking for some thoughts on where to go next as running out of ideas. I have an ASUS RT N56U router pluged into a Draytek Vigor 120 ADSL modem. All has been good until a few weeks ago when my net speed has dropped to almost unusable speeds. Did some digging and this only seems to be the WAN to LAN link on the router. I connected up a laptop using a cable direct to the modem and I was consistently getting 8Mbps on various speed tests and browsing is fine. I connect up the router and again via a wired connection to the laptop I am now getting 1.5 Mbps and browsing is painfully slow. I have tried different wires between the modem and router and also unplugged everything else from the router to make sure there is no interference. I have tried different LAN ports to rule out a dodgy one (and confirmed the same speeds via wireless). I then figured that maybe one of the firmware updates broke it so reverted back to a previous that I know was fine but still the same. QoS is definitely off on the router and I can not see any other options that might affect the throughput. Other than something failing on the router is there anything else I should consider first? Has anyone seen similar? Could this actually be something else manifesting itself as a problem that looks like a faulty router?