Thanks for those helpful comments. It turns out that xdslcmd profile --show
does not show very much,
but xdslcmd info --cfg
shows the state of the configuration and confirms that my earlier configuration attempt was not saved.
And profile --save
# xdslcmd profile --save
xdslcmd --save is only supported from Linux404 on ward
The save that did something was one level higher, to the ATP prompt. However, it didn't seem to save the xdslcmd configuration.
Successed in saving config datas
I'm giving up for now. My line doesn't seem to be in significant danger of getting interleaved (unless I play with the modem too much); but it does seem a shame not to be able to reduce that danger considerably more.
Recently moved from BT Infinity 2 to PlusNet. Very happy so far.