Got another entry for the ISP configuration page, though I'm not sure how much of this is actually needed and how much the software figures out itself.
The ISP is "Pure Telecom 100Mb SIRO fttc". I got it working in deepest, darkest, rural Ireland
config atm-bridge 'atm'
option vpi '1'
option vci '32'
option encaps 'llc'
option payload 'bridged'
option nameprefix 'dsl'
config dsl 'dsl'
option annex 'a'
option line_mode 'vdsl'
option ds_snr_offset '0'
option xfer_mode 'ptm'
config interface 'wan'
option device 'dsl0.10'
option proto 'pppoe'
option username 'puretelecom@puretel.ie'
option password 'broadband1'
option ipv6 '0'
option service 'internet'
You'll note that I have IPv6 disabled. I don't know if Pure Telecom do IPv6 - I'll maybe ask, and try and set it up, later.