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New Contributor Mick_K
New Contributor

Slow (unusable) speed on NBN with VPN enabled

Hi there,

I am 7 days into a 2-year NBN50 plan (HFC) with Optus.

Generally happy despite a speed drop from Telstra non-NBN cable but I have basically no connection when I hook up to my work's VPN.  Upload is 0.01MBps, so can't event create an empty folder on the work network drives.

I switch my cable back to the Telstra router and everything works fine on the VPN with good speed.

 

I thought it might have been the (new model) Sagemcom router, so connected straight to the NBN ethernet cable and got similar results, so the router doesn't seem to be the issue.

It looks like something on the Optus line / NBN is blocking my VPN traffic.  Any tips on how to troubleshoot this?  I have logged with Optus who said it was an NBN fault and then NBN said it wasn't their fault without visiting.  So 1 week in I am looking to pull the plug if I can't get this resolved.

Speedtest results below:

ConnectionVPN enabledPingDownloadUploadLink
Optus NBN via sagemcom routerNo VPN3045.6318.73https://www.speedtest.net/result/8699831304
Optus NBN via sagemcom routerVPN enabled559.870.11https://www.speedtest.net/result/8699826875
Optus NBN direct to NBN boxNo VPN2945.0818.19https://www.speedtest.net/result/8699376056
Optus NBN direct to NBN boxVPN enabled404.450.1https://www.speedtest.net/result/8699372529
Telstra Cable via Netgear routerNo VPN2667.85.18https://www.speedtest.net/result/8699852280
Telstra Cable via Netgear routerVPN enabled2437.984.88https://www.speedtest.net/result/8699944274

 

Appreciate any advice!

 

MK

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Online Community Manager
Online Community Manager

Re: Slow (unusable) speed on NBN with VPN enabled

It's not uncommon for a VPN to degrade speeds to a certain degree, but not to the extent that your speed tests are showing. 

 
I can't speak for the specific staff VPN client you're using at home, but in general- speeds shouldn't be throttled for customers using a VPN. I often work from home and I don't experience any noticeable issues when connected to my VPN at home on the Optus FTTP NBN Network. 

 
If we raise a ticket with NBN, they'll perform a remote diagnostic from their end. If they're able to see two-way data flow and the speeds are in line with what we'd expect, they'll close your ticket and it's to us to troubleshoot the issue. 

 
They'll only send out a technician if the results of their tests indicate that there's an issue on the NBN network.  Do you have the Optus fault reference number? I can check if there's been progress on our side. 

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New Contributor Mick_K
New Contributor

Re: Slow (unusable) speed on NBN with VPN enabled

Thanks for the reply. 

 

The ticket number I received is 21791285.

MK

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Honoured Contributor
Honoured Contributor

Re: Slow (unusable) speed on NBN with VPN enabled

Try remove the Optus modem and just plug your PC straight into the NBN modem. Confirm you can
a) Just surf the web normally and
b) the VPN works at full speed
Peter Gillespie
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New Contributor Mick_K
New Contributor

Re: Slow (unusable) speed on NBN with VPN enabled

Thank Peter. 

 

Yes I have tried that already. Speed test results don't really change whether I am going via the sagemcom router or directly to the nbn box via Ethernet cable. 

 

MK

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New Contributor Mick_K
New Contributor

Re: Slow (unusable) speed on NBN with VPN enabled

Had Optus technician visit today.  Saw the same slow speeds when on the VPN.  Saw the expected speeds when off the VPN and also when connected to the VPN either via Telstra Cable or 4G via phone hotspot.

Spoke to supervisors and other techs and said there was nothing they could do.

So looks like I'll be starting the process of backing out of my Optus 2 year plan after 10 days and go back to Telstra Cable for as long as it is active.  

Summary:

  • VPN via Telstra cable - works fine
  • VPN via Telstra 4G phone hotspot - works fine
  • VPN via Vodafone 4G phone hotspot - works fine
  • Non-VPN via Optus NBN works fine
  • VPN via Optus NBN - Sagemcom router - can only get about 5MBPS down and 0.01MBPS up
  • VPN via Optus NBN - direct to NBN box - can only get about 5MBPS down and 0.01MBPS up

Surely there are others out there using Optus NBN via HFC and connecting to VPNs? I work for a large Australian company (10,000+ staff) and we use Cisco VPN client.

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Honoured Contributor
Honoured Contributor

Re: Slow (unusable) speed on NBN with VPN enabled

Thanks for the update. Regrettable the Optus technician felt they could do nothing. As its an NBN connection I would have assumed the next stop would be for Optus to arrange a NBN technician to come out.

At this stage (after cancelling the contract) I would suggest you try another RSP that offers month to month contracts. As I see it the issue is either

1) Optus in which case another RSP could work or
2) NBNCo in which case the other RSP might have better luck getting NBNCo to fix it.

Peter Gillespie



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