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Curious IPv4 / IPv6 behaviour using ThinkBroadband speed test

Nibiru
Community Veteran
Posts: 5,740
Thanks: 413
Fixes: 10
Registered: ‎11-08-2007

Curious IPv4 / IPv6 behaviour using ThinkBroadband speed test

My home network has successfully used both IPv4 and IPv6 since around 2013.

The IPv4 WAN is a static Plusnet address.

The IPv6 WAN is a 6in4 tunnelled connection using the Hurricane Electric IPv6 Tunnel Broker.

 

On the following screenshots of my router's WAN traffic, the upper graphs show the IPv4 WAN traffic, and the lower graph shows the IPv6 traffic.  The blue traffic shows the incoming data from the internet in to my router, whereas the orange traffic is the outgoing data being sent from my router towards the internet.  Because the IPv6 traffic is tunnelled over IPv4, whenever IPv6 is present on the lower graph, then there will be the same corresponding traffic shown on the upper IPv4 graph.

 

Doing a typical IPv4 speed test, in this case using Ookla speedtest.net

I get the expected 68Mbps download and 18Mbps upload showing on the upper IPv4 WAN graph

and barely any IPv6 traffic detected.

Ookla IPv4 speed test.jpg

 

This time, doing an IPv6 speed test, in this case using speedtest.tools.uebi.net 

I get the expected 68Mbps download and 18Mbps upload showing on the lower IPv6 WAN graph

and the corresponding tunnelled traffic showing on the upper IPv4 graph.

uebi IPv6 speed test.jpg

 

So far all is as expected ! - and with most other speed test checkers I get the same results.

 

HOWEVER when I use the ThinkBroadband Broadband Speed Test something different occurs !

 

thinkbroadband speed test.jpg

 

If I select the [Run IPv4] option, something odd happens.

The download portion of the speedtest occurs correctly using the chosen IPv4 protocol,

however the upload is being sent from my network using IPv6 ! ?.

ThinkBroadband IPv4 speed test.jpg

 

 

The opposite effect occurs if I select the IPv6 enabled [Run Test] option

This time the download portion of the speedtest occurs correctly using the chosen IPv6 protocol,

but now the upload is being sent from my network using IPv4 ! ?.

ThinkBroadband IPv6 speed test.jpg

 

Can anyone else with IPv6 repeat this odd behaviour using the ThinkBroadband speed test ?

 

Plusnet FTTC 80/20 IPv4/30, Hurricane Electric 6in4 IPv6/48, Pulse8 landline & calls, SamKnows 600N
Vigor 130 modem, pfSense 2.6.0 router, DrayTek WAPs, Devolo dLAN 500, Gigaset N300A-IP VoIP DECT