I noticed that the factory default ATM VPI VCI settings on my DLink modems (ADSL) are something like VPI = 0, VCI =33 (or maybe 34, I forget). I doubt that VCI-33 works.
Kitz points out that it should be 0 / 38 for BT lines. Is it different for some LLU services?
I don't understand how these fields work with virtual circuit-based muxing and RFC2684 (RFC1483)? I realise that I've never understood it properly. Do these fields get set uniquely for each vc that is set up to carry each type of ‘higher level’ protocol eg IPv4 that is in AAL5 payload?
If that theory is correct, and the values change anyway per carried protocol, then what do the standard per-ISP runes quoted - such as 0 / 38 - mean?
Any reading matter / links ?
I looked at the wikipedia article on ATM for guidance on these matters, absolutely as clear as mud.