nanog mailing list archives
Re: NIST NTP servers
From: Mel Beckman <mel () beckman org>
Date: Tue, 10 May 2016 03:08:16 +0000
NTP has vulnerabilities that make it generally unsuitable for provider networks. I strongly recommend getting a GPS-based time server. These are as cheap as $300. Here is one I use quite a bit: http://www.amazon.com/TM1000A-GPS-Network-Time-Server/dp/B002RC3Q4Q You’ll have a stratum 1 clock on site. Hard to beat. -mel On May 9, 2016, at 8:01 PM, b f <freetexwatson () gmail com<mailto:freetexwatson () gmail com>> wrote: Hello List, In search of stable, disparate stratum 1 NTP sources. Looking for anyone’s advice/experiences (good/bad/ugly/weird) using NIST’s NTP servers per: http://tf.nist.gov/tf-cgi/servers.cgi We tried using “time.nist.gov<http://time.nist.gov>” which returns varying round-robin addresses (as the link says), but Cisco IOS resolved the FQDN and embedded the numeric address in the “ntp server” config statement. After letting the new server config go through a few days of update cycles, the drift, offset and reachability stats are not anywhere as good as what the stats for the Navy time server are - 192.5.41.41 / tock.usno.navy.mil. I would greatly appreciate and feedback / advice, etc. Thanks!!! Ed
Current thread:
- NIST NTP servers b f (May 09)
- Re: NIST NTP servers Mel Beckman (May 09)
- Re: NIST NTP servers Spencer Ryan (May 09)
- Re: NIST NTP servers Majdi S. Abbas (May 09)
- Re: NIST NTP servers Steven Miano (May 10)
- Re: NIST NTP servers Stephane Bortzmeyer (May 10)
- Re: NIST NTP servers Valdis . Kletnieks (May 10)
- Re: NIST NTP servers Stephane Bortzmeyer (May 10)
- Re: NIST NTP servers Josh Reynolds (May 10)
- Message not available
- Re: NIST NTP servers Valdis . Kletnieks (May 10)
- Re: NIST NTP servers Eygene Ryabinkin (May 11)
- Re: NIST NTP servers Jean-Francois Mezei (May 12)
- Re: NIST NTP servers Mel Beckman (May 09)