On Sep 16, 2007, at 8:42, Nelson Minar wrote: > Congratulations! > > One thing I'm very curious to learn about is the effect of ISP caching > of DNS lookups. The results from the new server have a 10 minute > expiry; > in the worst case, does that mean an ISP like Turkish Telecom could > conceivably send all traffic for 10 minutes to a single IP?
Yeah. In the old system the ttl was 2700, the idea being to keep traffic from someone who already looked up the domain to the same 14 ips for longer, rather than have it expire and have EVERYONE go to whoever was currently in the pool. Now when we don't have the problem of a limited subset getting a lot of traffic I made it shorter so an ISP, like Turkish Telecom, won't keep pounding the same few servers for 45 minutes. Ideally it should be even lower, but one step at a time. > What are these text records for? > pool.ntp.org. 600 IN TXT > "217.160.252.91-100000" Debugging and testing. The 100000 is the netspeed (100Mbit) for that IP. (Servers with more bandwidth get more traffic now). By the way - 3 out of the 5 ntpns servers are running the new software now, so you should all see the traffic peaks be less dramatic soon. It'll be up to 24 hours before the old NS IPs have expired from your local cache. - ask -- http://develooper.com/ - http://askask.com/ _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
