Loss of download speed after installing openWrt 19.07.0-rc2 on Zyxel - NBG6616

So I installed the mentioned version of OpenWrt on my router, because I wanted to run some QoS on it, but after installing it, my download and upload speeds have dropped quite a bit. My current connection is 300/300 Mbit but is soon upgraded to 500/500. I'm not sure what the problem is, since everything is actually working, but with less speed.

Any advice on this?

I could try the newest stable release of course, but this problem is a bit worrying. I'm fearing it might just be the router that can't handle max speed of my connection with OpenWrt, but this is beyond my knowledge. The router came preinstalled with some kind of OpenWrt styled by Zyxel and never had any problems reaching max speed on both download and upload, but I suppose Zyxel could have tweaked the firmware somehow.

Hope you guys can help with some info or advice. I hope I can get it to work with the full speed of my connection without having to go back to the stock firmware.

Since stable 19.07 is out today, maybe you could give it a try first?

I think I will. Not sure if my NBG6616 supports it, but I'd like to try at least a stable version on my router before dismissing OpenWrt and going back to the Zyxel firmware.

I'm hoping to get some info regarding the router itself, if it's actually fast enough to run OpenWrt properly, before trying to solve this issue. It's not worth throwing hours at fixing it, if it can't be fixed due to the router being too weak :slight_smile:

From what I can see it is supported since 18.06.5.https://openwrt.org/toh/zyxel/nbg6616
My guess is that the slow speed is because of hardware nat offloading not enabled.

A friend of mine mentioned something about offloading, but I couldn't find it anywhere in the settings. How do I enable hardware nat offloading?

In the main firewall setup page there should be a couple of tickboxes for that.
If not verify that the device indeed supports it in OpenWrt before trying to set it SSH.

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