I have been considering buying one of these for my new router but honestly I really need to know what the throughput speed is between the LAN and WAN interfaces before I go for it. I have been burned twice by so called gigabit routers that offer full gigabit speeds between computers on the lan but suffer from horrible bottlenecks when it comes to passing packets between the LAN and WAN interfaces. My last router a WNDR3700V4 kept failing download speed tests capping out around 150-160 mbps down with a modem provisioned for 300mbps.
Basically what I want to know is what the throughput speeds of this router are tested with the most recent DD-WRT build because I really want something that is somewhat futureproof since broadband companies have been bumping up internet speeds rather frequently the last few years.
I am running into the same problem, I got 150Megabit line (165ish during actual speedtest) but my r6300v1 running DDWRT throttles at about 110Megabit. If I use stock firmware it gets full speed. Ive been researching the issue and it appears to have to do with Hardware NAT versus Software NAT. The Hardware NAT implimentation is not supported by any open source router software since its closed source and no one developed open source modules and will probably never do. So the only way to get full speeds of the router is to use stock firmware.... which is unfortunate.
If the router is fast enough then Software NAT may have enough throughput to be above your bandwidth. I saw someone mention that the followin equation should give you an approximate throughput of your Software NAT (non stock firmware). Take the processor speed and divide by 4.5. The r6300v1 has 600mhz processor. 600/4.5 = ~ 130 Megabit
This is a Gigabit router and theoretically should be able to get much faster speeds if using stock firmware.
Update on this. This was resolved in latest builds on ddwrt and Tomato firmwares. Both now support full Gigabit speeds on WAN.