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Zen Fibre 900 - low speed with 3rd party router

port262

Casual Member
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

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
 
Can you see CPU core usage on the Teltonika?

If one of the ARM cores is pegged at 100% during a speed test, I'd dare say it's PPPoE single thread performance limitation on the WRT firmware.
 
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Running a speed test from the Google Nest Hub (because it's hard wired rather than wifi) shows CPU use peaks at ~25%.

Screenshot 2022-11-27 19.33.05.png


The RUTX10 has a Quad-core ARM Cortex A7, 717 MHz - I'm not sure if this indicates the speed test has maxed out a single core - 100% of 1 of 4 threads = 25% CPU load?

The Fritzbox 7530 manual doesn't mention the CPU but boxmatrix.info says it is a Dakota @ 717 MHz - ARM Cortex A9 - CPU-Cores: 4. So same as the Teltonika except the A9 model instead of A7.

If this is the case and the RUTX10 can't support Gigabit broadband, what do you suggest would be a reasonable solution? Obviously I could chain the ONT into the Fritzbox and the Fritzbox into the Teltonika but having a full on router in front of the actual router seems a bit backwards.

Is there an alternative option that just performs the Modem functionality I could use in front of the Teltonika?
Sorry, I realise now this was a dumb question - the ONT performs the Modem function.

Or can you direct me to details of how to configure the Fritzbox to feed the Teltonika and avoid the perils of double NATting and other such issues I'm vaguely aware exist but don't fully understand?
 
Last edited:
Gigabit rate throughout pushes about most hardware in this class, especially if they are processing the (de)encapsulation / etc in software rather than silicon.

The Teltonika like most other (non ISP specific) routers will just do it all in software. PPPoE is single thread bounded in most(all?) implementations.

I don’t know precisely - but hazarding a guess - the Fritz has some form of dedicated acceleration / a hardware ASIC onboard that offloads any PPPoE processing, freeing up the main CPU cores for other tasks. Otherwise that A9 in the Fritz has some handy muscle over the A7 or the AVM folk have optimised / performant firmware code.
 
I'm starting to understand this now.

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.

Worst thing is I just sold my Draytek which had 4G LTE Cat6 after replacing it with a standalone 5G Modem routing into the Teltonika WAN. Potentially the Draytek could have achieved higher throughput.

Thanks for your help.
 
The Teltonika like most other (non ISP specific) routers will just do it all in software. PPPoE is single thread bounded in most(all?) implementations.
The efficiency of the software implementations can be wildly different too. It's my understanding the mainline drivers for PPPoE are not so great.
 
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The efficiency of the software implementations can be wildly different too. It's my understanding the mainline drivers for PPPoE are not so great.
From a lineage back to the earliest underpinnings in I think it was BSD back in the day...
 
I'm starting to understand this now.

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.

Worst thing is I just sold my Draytek which had 4G LTE Cat6 after replacing it with a standalone 5G Modem routing into the Teltonika WAN. Potentially the Draytek could have achieved higher throughput.

Thanks for your help.
The hardest part is that ‘el cheapo’ ISP supplied routers have no problem getting the throughput as they will have dedicated silicon to run this optimally.

They churn out thousands of units though so there is really no cost to the ISP for this capability.

When you go shopping for third party routers it can be a bit of minefield to find ones that can do the business with PPPoE.

At least the Teltonika is relatively cheap. Some far more expensive and flashy Ubiquti routers struggle with PPPoE at high bit rates. Much to the annoyance of their owners who thought they were getting a premium top shelf and hence top performing product….
 
Yeah, that was me cross posting, wasn't sure if I'd get any response so asked in a couple of places.

It's unfortunate that laymen like me are unaware of the bigger picture when selecting hardware and end up making costly mistakes.

And this is on top of having invested in a 5g modem and external antennas (the 4g mast is 200m away so I get up to 200/45Mbps, presumably it will become 5g at some point) because there was no public timeframe for fibre being available - and it went in 4 months later.

Any luck the Teltonika engineers will get a software fix in place soon.
 
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Look at it this way; the 5G modem / external antennas are a good failover / backup solution.

FTTP isn’t invincible.

Similar hardware specs in the Fritz suggest the base hardware is in the capable category - I wouldn’t like to guess what or when the future firmware versions from Teltonika will be able to deliver.
 
Some Drayteks have limitations too, my 2595 max's out at 300+mbs according to Draytek themselves due to firewall computations. Later ones are better but worth checking with Draytek before purchase.
 
Look at it this way; the 5G modem / external antennas are a good failover / backup solution.

FTTP isn’t invincible.

Similar hardware specs in the Fritz suggest the base hardware is in the capable category - I wouldn’t like to guess what or when the future firmware versions from Teltonika will be able to deliver.
A failover option was always on the cards, just not in this order.

> FTTP isn’t invincible.
Case in point being the engineer ran the cable from the pole to the building via a tree. No real option there but I'll need to get the saw out to lop some limbs off.

Teltonika support noted two specific firmware versions that have PPPoE improvements on the roadmap. Just not the expected release dates.

Some Drayteks have limitations too, my 2595 max's out at 300+mbs according to Draytek themselves due to firewall computations. Later ones are better but worth checking with Draytek before purchase.
It was a 2866Lac. The relevant specs seem to be
  • 950 Mb/s NAT Throughput for Ethernet WAN with Hardware Acceleration
  • 1.8Gb/s Total Multi-WAN NAT Throughput
  • 700 Mb/s NAT Throughput per WAN without Hardware Acceleration
 
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