Zen Fibre 900 - low speed with 3rd party router

Hi,

Can anyone help me figure why my Teltonika RUTX10 doesn't achieve the same download speed as the Zen supplied Fritzbox 7530 router?

The Fritzbox achieves close to the maximum download speed of 900Mbps however the RUTX10 peaks at 250/mbps. Interestingly the maximum upload speed quoted by Zen is 100Mbps which the RUTX10 can achieve.

Speed tests were performed on speedtest.net, fast.com and my own FTP servers.

I followed the Netgear Ping Test to determine Optimal MTU Size for the Router
https://kb.netgear.com/19863/Ping-Test-to-determine-...

The result is 1464 + 28 = 1492. This matches the 1492 value shown by Zen in one of their tutorials to configure an ASUS router. I set Override MTU to 1492 in the RUTX10 Advanced Settings.

Zen Technical Support are not interested in discussing 3rd party kit and I don't want to plug the ONT into the Fritzbox WAN then the RUTX10 into the Fritzbox LAN and end up with double NATting. Ultimately I can't use the Fritzbox as there are several services running on the RUTX10 including Wireguard.

Other potentially relevant points are
- all LAN ports on the network support gigabit speed (RUTX10, TSSW110 switch, Dell Precision workstation)
- the Dell Precision has a 11th Gen i7-11700 @ 2.50GHz plus 16gb RAM
- file transfers from the Dell Precision to Synology NAS achieve 100MB/s
- the Fritzbox has the option VLAN-ID set to 101 - I can't see an equivalent setting in the RUTX10 configuration but believe it should be autodetected or set by the upstream provider?
- the RUTX10 is running the latest firmware version RUTX_R_00.07.02.7.

Can anyone suggest what might be wrong or how to investigate further?

Thanks,

Chris

Update - I found that enabling software flow offloading which disables QoS and SQM features has doubled the download speed achieved to 500Mbps.

Can anyone suggest any other settings I can look at that may further improve the download speed?

Thanks

Final update - Teltonika support confirmed ~700Mbps is the likely maximum bandwidth that can be achieved over PPPoE on the current firmware.

Also that they are working to improve this with 7.3 and 7.4.

Time to get a better router that can handle the trhoughout

In reply to a post by Ripley:

Time to get a better router that can handle the trhoughout

Open to suggestions, bearing in mind the Wireguard requirement.

Are we looking at a dedicated box eg. Protectlii running Opnsense? I read about this before settling on the Teltonika and came to teh conclusion that stability was not suitable for an ape like myself that just wants it to work.

The fritzbox lab firmware (beta) adds wireguard I believe https://en.avm.de/fritz-lab/fresh-from-development/f...

You're correct, according to the link FritzOS added Wireguard support in v7.39.

I'll check that out and see if the Fritzbox allows the firewall rules I need. From memory, on the Fritzbox I used several years ago didn't really offer fine grained control but that may well have changed.

Thanks