New full fibre connection issues

[#1]

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@Dan_the_Van wrote:

@gj972639 

I would suggest setting up a BQM (broadband quality monitor) details found here

https://www.thinkbroadband.com/broadband/monitoring/quality  You will need to enable ICMP on the router.

This will give a view from the outside of you connection state, just be warned as you have a dynamic IP Address, you would need to make allowances for that.

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Fortunately @gj972639's "TUF-AX3000_V2" router supports a DDNS client, therefore a 'hostname' can be configured so that the ThinkBroadband BQM follows any WAN IP address changes.

[#2]

@gj972639 

For what it's worth here is my MTR test to Cloudflare DNS, to compare your result with my 80/20 SoGEA connection. As you can see there is no packet loss on any hop, so your dropped packets are likely to be your router or somewhere between you and Plusnet's gateways.

My MTR test -

$ mtr -w -c 1000 -r 1.1.1.1

HOST:                          Loss%     Snt   Last   Avg  Best  Wrst
  1.|-- GA-J3455N-D3H           0.0%    1000    0.2   0.2   0.1   0.2
  2.|-- ???                     0.0%    1000    5.7   5.7   5.6   5.9
  3.|-- ???                     0.0%    1000    5.8   5.7   5.5   5.8
  4.|-- 141.101.71.244          0.0%    1000    6.7   6.7   6.5   6.8
  5.|-- 141.101.71.107          0.0%    1000    6.6   7.0   6.4   7.9
  6.|-- one.one.one.one         0.0%    1000    6.4   6.4   6.2   6.5

@gj972639 's MTR test -

[#3]

@gj972639 

Take a look at this thread https://community.plus.net/t5/Full-Fibre/Just-had-it-installed-as-of-27th/m-p/2039034#M29962 

A TUF-AX3000 V2 router is also being used.

[#4]

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@gj972639 wrote:

New FTTP install showing persistent packet loss (4–16%) to multiple public IPs.

• Reproducible on Windows and Linux

• Reproducible across two routers

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@gj972639 

From your MTR test result, one of your routers appears to be a "TUF-AX3000_V2"

What other models of router have you tried ?

[#5]

I set up the BQM and it just shows the same thing, consistent up to 20% packet loss but in every other way it's fine.
https://www.thinkbroadband.com/broadband/monitoring/quality/share/5d17b01f29c226124c599e61a4667cce30...

And yes, the fibre cable is solidly in the ONT, and the ONT lights are showing everything is fine.

@LatencySlayer  The ASUS router is fully up to date, I made sure of that before I started using it. But the same issues happen the exact same way on the Plusnet router I was sent when I joined. Also over a selection of ethernet cables ranging from cat 6 to cat 8.

I've also tried plugging directly into the ONT (which is why the BQM shows a brief period of 100% packet loss) But the same  problem persisted in the traceroute at the same point in the connection. Roughly 10% loss starting at the ip 172.16.17.205

The router/cables aren't the issue as the problem is still apparent even when entirely bypassing them. The problem begins at the ONT or further along the connection somewhere.

[#6]

This site is handy https://dnschecker.org/all-tools.php#ipTool 

I see this for your IP Address from my network connected directly to my router

mtr -r -c 100 46.208.243.18
Start: 2026-03-01T13:19:14+0000
HOST: wireguard-iv                Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- Archer_AX53                0.0%   100    0.6   0.6   0.4   2.5   0.2
  2.|-- 251.core.plus.net          0.0%   100    5.8   5.9   5.0  10.1   0.8
  3.|-- 217.32.25.136              0.0%   100    5.8   6.1   5.4   9.7   0.5
  4.|-- 109.159.255.40             0.0%   100    6.4   6.0   5.3   7.1   0.4
  5.|-- core6-hu0-4-0-15.faraday.  6.0%   100    6.4   6.5   5.8  15.5   1.0
  6.|-- core2-hu0-15-0-4.southban  0.0%   100    6.1   6.6   5.8   8.6   0.5
  7.|-- ???                       100.0   100    0.0   0.0   0.0   0.0   0.0
  8.|-- ???                       100.0   100    0.0   0.0   0.0   0.0   0.0
  9.|-- 18.243.208.46.dyn.plus.ne  8.0%   100   11.9  11.9  10.8  13.2   0.5

[#7]

@gj972639 

I can't think of any further diagnostic tests to suggest at the moment, as you clearly have a problem with both incoming and outgoing traffic data loss.

Perhaps a staff member (such as @Marsh ) can be prompted to take ownership of this problem ?.

I've not seen a TBB BQM plot look like that since the early days of ADSL 

[#8]

@gj972639 

Similar to @Dan_the_Van seeing 8% packet loss by pinging your WAN address

I'm consistently seeing 12% loss over multiple test runs -

                             Loss%   Snt   Last   Avg  Best  Wrst
18.243.208.46.dyn.plus.net   12.0%   100   11.4  11.5  10.8  12.3