Yesterday evening I had an internet disconnect and, after my router indicated I was reconnected, I found that I couldn't reach any sites beyond the router. Looking at the router log, I saw that the IP address that had been assigned was 172.20.n.n (where 'n.n' are the same numbers as the last two numbers of my router's 192.68.n.n internal IP address - coincidence?). Once normal service had been resumed (after another disconnect/reconnect cycle) I checked this IP address and found that it's in one of the other ranges used for private internal addresses.
I've got a vague memory that, with FTTC, there can be a conflict between Plusnet's DNS servers and BT's in certain situations. The workaround is to manually input the addresses of Plusnet's DNS servers into the router settings, which I did a while back and have since kept to. Is the 172.20.n.n IP address one that could have resulted from such a conflict, or does it look like a different problem?
Graham
