> On Oct 12, 2015, at 11:43 AM, Anton Samsonov <[email protected]> wrote: > > As recommended for comments and questions, I wrote to Ask Bjørn Hansen > for an explanation, but he just said that this topic was not for discussion > and redirected me to this mailing list as the only source of information.
Hi Anton, I just wanted to address this one part as I was alarmed to read that I’d said something relevant wasn’t open for discussion. I looked in my archive and I think that was a misunderstanding. Quite the opposite I meant for you to open up the discussion with the rest of the community (as you did now, thank you!). My reply was very brief and I can see how you took it as being brushed off; that wasn’t at all my intention. This was what I wrote: > Would you mind posting the question to the pool list so we can see what the > rest of the community thinks? > > https://lists.ntp.org/listinfo/pool Anyway, on to your question: > But the thing that puzzles me the most is why to blacklist anything at all? > NTP is able to select the best of the best of the best servers automatically > and keep all falsetickers, unreliable and simply too distant servers out. > Then why the pool places own artificial restrictions atop of that? Most of the clients of the pool are SNTP clients that often aren’t very good at detecting false tickers, though that’s not the reason to block 6to4 “tunnels” more than any other “more likely to be sub-optimal” IP. The reason the 6to4 addresses are blocked is actually just an accident of the way the IP sanity check is implemented. It’s using the Perl module Net::IP and then checking that the address is an "GLOBAL-UNICAST” or “PUBLIC” address according to that module. Because 6to4 is a separate address block (similar to link local and loopback addresses) it ends up being rejected. Considering 6to4 is deprecated and unlikely to work better or be more relevant as time goes on I’d rather not special case it generally. However it would be interesting to add your IP and see how it goes, in particular if you can add both your IPv4 and your 6to4 IP. If you agree then send me the address then I will add it into the system. Ask _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
