I'm after any pointers with the following if anyone fancies a challenge ... download bandwidth is roughly specified for information but you'll get the gist.
I've tried an RB493G and a VMWARE based RouterOS installation with the following and found the same results.
2x FTTC lines, 150m from cabinet.
ISP is Andrews and Arnold.
Both lines according to BT man will sync way in advance of the 80/20 they are currently limited to.
A laptop plugged directly into an individual line will speedtest at close to 80/20, I've tested this on both lines.
2x Laptops plugged into a line each and tested at the same time as separate links also speedtest at close to 80/20 each so they can clearly run at full rate at the same time without affecting each other.
Plugging the Openreach FTTC modems into either my RB493G or RouterOS on VMWARE with download from A&A routed down to me on either line individually will give full downstream bandwidth as expected of 80. This is fine for either line I choose to route down.
Bonding the upstream lines using route-marking in RouterOS gives close to expected bonded performance of upstream bandwidth, about 38 ish.
Now for the confusion ....
If I select to have A&A send me packets down alternate lines it all goes horribly wrong. You would expect roughly double the download (less the obvious overhead) but I end up lucky to receive anything over 20 from a potential of 160 available.
The router receiving the traffic has a very simplistic configuration with eveything I can find turned off so I don't think it is doing anything odd and the CPU does not seem to top out or anything like that.
I'm aware of other users, using RouterOS and A&A to achieve the same thing so you could argue it's not FTTC, it's not A&A and it's not BT but it's definitely something as I'm paying for an 80mbps line I'm barely using.
A&A were going to send me a Firebrick to prove the lines work fine on the basis if I plug a Firebrick into my two lines at this end and get 160/40 (ish) or at least not (20/40) then clearly it's a RouterOS issue but at the moment this does not appear like it's going to happen.
I'm after any advice or help anyone might be able to offer?
Many thanks, Dominic.