a) I would use a 1Gbps wired connection to the router for such tests. On Windows, check the Status of the connection does show 1Gbps as it is easy to use a cable which is only good for 100Mbps.

b) Certainly for Windows, reboot the PC

c) Quite likely your problem is contention on the backhaul.

d) Try the dslreports.com speed test. If you create an account they will keep a history of your tests for you.

In reply to a post by RobertoS:

Just reading up on Thunderbolt + the Ethernet adapter, and one buyer's review says he had to turn off his Air's wifi.

On Windows myself I found on some machines that were on wireless, just plugging in an Ethernet cable didn't automatically replace the existing wifi connection.

Probably a red herring but worth a try.

Yes that's correct. Wifi adapters have a higher binding order than LAN port on both MacOSX. I made sure wifi was turned off. Good spot tho!

In reply to a post by chimpingtonuk:

Yes that's correct. Wifi adapters have a higher binding order than LAN port on both MacOSX. I made sure wifi was turned off. Good spot tho!

Just use 'Set Service Order' in Network Preferences.

In reply to a post by Michael_Chare:

a) I would use a 1Gbps wired connection to the router for such tests. On Windows, check the Status of the connection does show 1Gbps as it is easy to use a cable which is only good for 100Mbps.

b) Certainly for Windows, reboot the PC

c) Quite likely your problem is contention on the backhaul.

d) Try the dslreports.com speed test. If you create an account they will keep a history of your tests for you.

Confirmed using 1GB link. Interestingly the speed doesn't vary very much at all using wired or wireless (I'm a few feet away from the router) I may have to downgrade to a 200mb circuit according to BT.

In reply to a post by chimpingtonuk:

I may have to downgrade to a 200mb circuit according to BT.

Meaning:

- we don't know what is wrong;
- we aren't going to bother trying to find out;
- we don't care;
- tough.

Is that first-line support or have you got through to someone who has a clue?

I'd guess, as someone else already has, that there is a profile somewhere that is capping this, my guess would be at BT Retails end of things. Doubtless they will want to send out some poor Openreach sap who will be able to get [censored] all done to resolve, but who will have to waste many hours being shoved pillar to post to get there.

My suggestion is that the ISP needs to delete then rebuild the account their end.

Good luck, and keep us posted.

Edited by Zarjaz (Tue 05-Jan-16 12:49:39)

Is it also possible that the SVLAN the guy is on doesn't have the capacity to deliver 300Mb?

He wouldn't be the first person to be sold 330Mb on an SVLAN smaller than his line's capacity.

I responded to Zarjaz on this but will post here, too. I find myself wondering if the SVLAN you're connected to, the smallest unit of capacity on the BT Wholesale network that you're using, is smaller than your 320Mb IP profile.

Andrews and Arnold has a case of a customer who couldn't get above your kind of performance as they were on an SVLAN smaller than their line's capacity.

You can shove a surprisingly large amount of FTTC customers into 200 - 250Mb.

Is it also possible that the SVLAN the guy is on doesn't have the capacity to deliver 300Mb?

In all honesty I don't know. Is there some way this can be checked, as in how did the punter in your referenced tale discover the cause ?

In reply to a post by Zarjaz:

Is it also possible that the SVLAN the guy is on doesn't have the capacity to deliver 300Mb?

In all honesty I don't know. Is there some way this can be checked, as in how did the punter in your referenced tale discover the cause ?

Andrews and Arnold. Enough said.