nanog mailing list archives
Re: TWC (AS11351) blocking all NTP?
From: "John R. Levine" <johnl () iecc com>
Date: 3 Feb 2014 15:29:21 -0500
It seems thata hosts sending large amounts of NTP traffic over the public Internet can be safely filtered if you don't already know that it's one of the handful that's in the ntp.org pools or another well known NTP master.Speaking as one of the 3841 servers in the pool.ntp.org pool, I'm happy to be described as a "handful," something my mother used to say, but I do feel obligated to point out that it's a pretty big handful especially if you want to be fiddling ACLs on an hourly basis which is pretty much what it takes.
I was thinking that the ntp.org servers on any particular network are a small set of exceptions to a general rule to rate limit outgoing NTP traffic.
Regards, John Levine, johnl () iecc com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. http://jl.ly
Current thread:
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP?, (continued)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Mark Andrews (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Randy Bush (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Jay Ashworth (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Saku Ytti (Feb 05)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Jared Mauch (Feb 05)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Saku Ytti (Feb 05)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Octavio Alvarez (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Mark Andrews (Feb 04)
- Re: TWC (AS11351) blocking all NTP? Damian Menscher (Feb 04)
- Re: TWC (AS11351) blocking all NTP? John R. Levine (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Jared Mauch (Feb 03)
- Re: TWC (AS11351) blocking all NTP? John R. Levine (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Joe Greco (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Valdis . Kletnieks (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Doug Barton (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Majdi S. Abbas (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Doug Barton (Feb 03)
- Re: TWC (AS11351) blocking all NTP? Blake Dunlap (Feb 04)