Slow speeds BT Fibre 900

Hi All,
Wondering if someone could help me out trying to figure out why i'm not pulling the 910mbps on my new FTTP install?

Setup is :
USG4-Pro router, Unifi Switches / APs.

Just did a test on a PC physically plugged in to the switch on I.E browser :




Yesterday i reconfigured the whole network from fresh as was having DHCP issues with the USG, so not sure if that is to blame.
I tried the smarthub2 and was getting about 400mbps download.

any ideas?

thanks!

Edited by deleted (Thu 04-Jun-20 11:44:31)

Use the smarthub, connect one PC via ethernet. If you don't get the speeds, then call BT as you could be on the wrong profile.

Rule out ALL of your network kit in this testing.

okay will do that.
Is there a best way of doing a speed test? is there a non browser based one that can be used?

haven't done anything, just tested again and got this using the IPv4 test :



and the IPv6 one is slower?

Edited by deleted (Thu 04-Jun-20 11:43:03)

The IPv6 issue could be due to a lot of things. Router firmware is one. For example, my Mikrotik hEX PoE can do over 900Mbps of IPv4 with Fastpath, but only ~300Mbps of IPv6 because the vendor hasn't implemented Fastpath for IPv6.

There are other system optimisations, like TCP offloading for your network card, which might only work for IPv4 and not IPv6.

You *should* get native IPv6 from BT, but worth checking you've not picked up Teredo tunnelling or something weird like that. Look at the first two parts of your IPv6 address (2XXX:XXXX:), either post here or check with a "whois" service, and it should be clear if this is a BT native IPv6 address or not.

The trouble with gigabit services is that they turn up these sorts of issues

Speed test should not pick up the weird stuff, if auto detecting as BT IPv6 then seeing a public IPv6 address

The file downloads at https://www.thinkbroadband.com/download can help those who want to avoid browser or doubt speed test script

For a non-browser speed test see here, for example

Been using the smart hub 2 since day 1 of the service and been getting pretty much max speed ever since
https://www.speedtest.net/result/d/5e0ccc50-94f0-414...

i too am suffering from slow speeds. i upgraded to the 900 the day it was launched, went live 2 days later.

when i hard wire to the hub, or set up a direct PPPoE connection to the ONT with my laptop (which is a high end laptop with Gigabit ethernet ) the most i see is around the 450 mark. upload is ok and is normally between 80 - 115.

the below test was just ran on a direct PPPoE with laptop.

https://www.thinkbroadband.com/_assets/speedtest/but...

Same!

Got the install on Friday last week i am only pulling in 500 down and 50 up using the smart hub they sent and when i use the netgear xr500 i get 550 down and 105 up.

Aware there is an issue with upload capping on the bt smart hub so have switched to the xr500 but not seeing any download going anywhere near 900 as of yet.

Tried direct to the ONT and all very similar.

Is there a settling in period like fttc i wouldn't have thought so as others getting full on day 1, also noticed my external ip address is changing even without disconnects which i found interesting.

I would do a BQM then it would all go red everytime the IP changes.

frustrated at the moment to say the least.

No settling in period, it should be full speed from the start. Just tested here, and got same 894/119 as always.

Sounds a bit like they might have goofed and put you on the 500 package.

Yeah I didn’t think there would be a settling in tbh, and yeah I agree thought crossed my mind about 500 package but with the upload going to 105 and more than that package allows it doesn’t appear so.

Think a call to the fibre team is needed.

In reply to a post by Seedorf:

Yeah I didn’t think there would be a settling in tbh, and yeah I agree thought crossed my mind about 500 package but with the upload going to 105 and more than that package allows it doesn’t appear so.

Think a call to the fibre team is needed.

Let us know how you go.

900 is coming my way soon and I did read about upload issues with the sh2 but I must have misread the topic as I thought it was only an issue for existing customers upgraded from a lower fttp product.

I hope I do not have the same issue.

Just plugged in smart hub 2 and did some tests, was getting the same.
Did a test from within the hub, and said getting speed etc, then it logged a fault?
So currently have a fault open with BT for something. Will give them a ring tomorrow to see if they know anything more.

I'm on BT FTTC (40/10) and notice that ping times on World of Warcraft with IPv6 are about 120ms and about 25ms to 30ms if I disable IPv6 and use IPv4 only on Windows 7. Using a Smart Hub 6A.

Anthony

In reply to a post by arendall667:

I'm on BT FTTC (40/10) and notice that ping times on World of Warcraft with IPv6 are about 120ms and about 25ms to 30ms if I disable IPv6 and use IPv4 only on Windows 7. Using a Smart Hub 6A.

Anthony

You might just be having bad routing for IPv6.
At the moment I am seeing 10ms latency for both IPv4 and IPv6, but I am using Windows 10.

But like I said it looks like a routing issue or a DNS one.

Paul

In reply to a post by bomber456:

Setup is :
USG4-Pro router, Unifi Switches / APs.

Do you have the full Deep Packet Inspection switched on for your USG4-Pro? That limits throughput to around 250Mb/s but I guess depending on network conditions and other factors it could be a bit more.

This is the main reason I switched to a UDM Pro prior to my FTTP install next Tuesday. Even with full DPI on it still has a theoretical throughput of 3.5Gb/s.

As someone already pointed out on this thread, the leap to almost gigabit speeds will unearth all sorts of previously extant but moot bugs/issues/quirks, and this one is bound to bite quite a few people even if it's not the issue here.

In reply to a post by G2covers:

This is the main reason I switched to a UDM Pro prior to my FTTP install next Tuesday. Even with full DPI on it still has a theoretical throughput of 3.5Gb/s.

The 3.5Gbps quoted is with DPI and IPS/IDS

But, just to warn you, a number of people - me included - have reported a bug with PPPoE on the UDM-Pro when IPS/IDS is enabled that limits throughput to sub-gigabit speeds (100-200mbps hit in my case). UI are looking into it

It's still a solid piece of kit

doesn't make a difference with DPI on or off, its the IDS/IPS that has max 250mbps through put?

Might have a look at the UDM Pro, but thought the USG-Pro-4 i have is more than capable for 1gbps throughput for internet?
unless there is a setting i need to turn on or off to fix this?

The 3.5Gbps quoted is with DPI and IPS/IDS

Sorry, yes. It was the intrusion detection/prevention features I meant, not deep packet inspection!

Thanks for the heads-up re: the PPPoE bug - I shall make sure IPS/IDS stays off for now.

Sounds like the OP has the same 'symptoms' as this bug, just on different hardware. Maybe just coincidence, but possibly same thing with a different cause?

Just an update, ive installed the UDM Pro now to replace the USG4-Pro.

https://fast.com/
Using this it shows 920mbps 100mbps upload.

using the ubiquiti speed test it shows 936down, 109.5 up.

but using any of the other speed tests i get only about 400-500down?
must be something to do with those testers?

I think both of those tests have issues, too.

fast.com always seems wildly optimistic, and I finally lost faith in the built-in UDM-P one yesterday when on my auto 6am daily test it reported 1032Mbps (something that is impossible with a gigabit connection).

Maybe try the cli version of speedtest, or the one from this site. These, at least, seem to offer some consistency - I don't know about accuracy.

Are you seeing the slowdown if IPS/IDS is enabled?

In reply to a post by PianSomB:

I think both of those tests have issues, too.

fast.com always seems wildly optimistic ....

The problem seems to be teh default settings, min 5 seconds. When I increase that to something sensible, I get the same 900ish as with tbb or speedtest.

Most consistent is the speedtest windows store app. Oddly, via browsers speedtest is the least consistent.

Edited by deleted (Wed 10-Jun-20 12:31:18)

I haven’t enabled the IDS/IPS yet, but will have a look later and enable it,