Posted: Tue Jul 29, 2014 20:06 Post subject: WZR-1750dhpd Limited to 300Mbps on wan connection with DD-WR
I bought a new router thinking I would get the full benefit of my gigabit internet that is offered where I live. When connected directly with my Mac, my speeds are upwards of 950 Mbps. When I connect my router to the internet and connect my Mac to the router with a Cat 6 cable, my speeds drop down to below 300 Mbps.
I called buffalo tech support and they said that this is a limtation with the DD-WRT firmware and I would have to flash to the non DD-WRT firmware to get my full speeds (and by the way once you go non DD-WRT you cannot go back).
Is this true, does DD-WRT have a hard limit of 300Mbps throuput from the wan to lan ports?
As far as the install goes, Buffalo tech support told me that today. He said "to inform you up front, once you go to the friendly firmware you cannot go back to dd-wrt". We were discussing the WZR-1750dhpd, which makes sense because of all the posts about flashing it.
Also, on in interesting note, i received this email today after I talked to tech support on the phone.
===============
Thank you for contacting Buffalo Support.
Your case number is xxxxxx.
The WZR-600dhp is a DD-WRT router. It runs the DD-WRT friendly version.
Buffalo Support Email is intended for non-critical support for customers in the United States and Canada. Any replies to this response will be handled in the order it was received. If you have an urgent issue that requires immediate attention, please contact our 24x7 support center at (866)752-6210.
Seeing that email almost makes me think that it is a faux DD-WRT build. The R7000 was like that. There was a firmware that you could install from myopenrouter.com, but it wasn't a real build, I think it was just the DD-WRT GUI running on the stock firmware.
WAN-to-LAN routing requires a lot of computational muscle. Very few consumer grade routers are capable of gigabit routing, and those that are all do it with the help of hardware acceleration.
If you disable hardware acceleration (or use a feature that hardware acceleration is incompatible with, like QoS), then you won't get gigabit routing speeds. It doesn't matter which router you have (whether it's the Buffalo 1750DHP, Asus AC68U, or Netgear R7000) or what firmware you are using: if you don't have hardware acceleration, you won't get gigabit routing speeds.
Support for hardware acceleration was only just added to DD-WRT; you'll need build 24710 or newer to use hardware acceleration. (Note to people who stumble on this thread: the firmwares in that link are only for Broadcom ARM-based 11ac routers like the 1750DHP.)
Last edited by code65536 on Sat Aug 02, 2014 21:07; edited 1 time in total
Thank you for your reply. If I move from the buffalo version to to straight dd-wrt, from what I read my wireless range will decrease. Is that still the case?
Thank you for your reply. If I move from the buffalo version to to straight dd-wrt, from what I read my wireless range will decrease. Is that still the case?
I don't think that's likely, since you have the DHPD version that came pre-loaded with DD-WRT (the only real difference, really, is the Buffalo branding). In most cases, difference in wireless performance result from proprietary binary-blob drivers vs. DD-WRT's open-source drivers. But since you are already using DD-WRT, I think you're already using the open-source drivers. But I've never used the Buffalo-branded firmware before, so I'm not 100% sure.
