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Speed/routing issues between two Vodafone 900Mbps Gigafast connections

2: Seeker
2: Seeker

Recently opted for Vodafone given their current pricing offer, had it fitted, PPPoE details given, custom router in, static IP set up and speed tests are golden to most web services, but after a few attempts to set up a VPN/tunnel to a friend also running Gigafast 900, we're seeing speed restrictions of around 110-230Mbps in perf3 un-tunnelled.

Tunnelling via a wireguard VPN seems to net about the same.

Running a web server on port 80/443 also sees the same sort of speeds.

Certainly odd as the two connections are geographically close by, I would have thought this would be the best case scenario for speed/routing.

Ping between the two is about 10ms, 5 hops in total.

I suspect traffic throttling between the two Vodafone gigafast IPs on their core network - seems to be the case as proxying the web server via a 3rd-party hosted VPS seems to regain full speed again.

Would rather not keep the proxy in place and have Vodafone diagnose the routing issues, definitely seems like some traffic shaping is being applied here.

Anyone had a similar experience?

Still within my 14 days and have logged a ticket with the technical team, if they can't solve it I'll be cancelling and going with a more premium provider.


16: Advanced member
16: Advanced member

You say you and your friend are on Gigafast 900. but there is no longer such a service being sold. (AFAIK)

So, are you both on a CityFbre connection?


That's correct, same package on CityFibre, advertised speeds of 900Mbit/s.

16: Advanced member
16: Advanced member

@chonkusZZ You said, "Running a web server on port 80/443 also sees the same sort of speeds.". Can you try moving the ports and see if that makes a speed difference. I know it's a pain having to make your URL something like but it would be interesting if the ports you are using are being "conditioned" by VF.

Seems to make no difference in all honesty. 

16: Advanced member
16: Advanced member

What broadband package did you have before? What speeds did you experience? 

I haven’t had any other providers with cityfibre. 

16: Advanced member
16: Advanced member

I just want to clarify, you've always been with vodafone on Cityfibre?

What results have you had previously with your VPN tunnel?

What results do you get from each connection?

Can you paste the results of a traceroute to from each connection? 

16: Advanced member
16: Advanced member

@chonkusZZ it's come to my attention that iperf3 has problems over the Internet between 2 networks. PPPoE has an MTU of 1492 so settings have to be changed to avoid fragmentation and re transmits.

An easier way to test the speed of the connection is to transfer a few large files at the same time between the two networks.