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devel / comp.protocols.time.ntp / Re: Using two NTP Server: Bad?

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* Re: Using two NTP Server: Bad?RG
`- Re: Using two NTP Server: Bad?Jimmy Hoke

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Re: Using two NTP Server: Bad?

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Subject: Re: Using two NTP Server: Bad?
From: abhijithrg007@gmail.com (RG)
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 by: RG - Fri, 15 Sep 2023 07:23 UTC

Sync with one server -> If the connection to the NTP server is lost the sync will be lost
Sync with two servers -> If two servers are configured it is not possible to tell which one provides more accurate time as no other reference times are available to compare.
Sync with three servers -> If one NTP source is in false-ticker state, the ntpd would be able to choose from the remaining two servers.

Re: Using two NTP Server: Bad?

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From: jhoke@jimmyhoke.net (Jimmy Hoke)
Newsgroups: comp.protocols.time.ntp
Subject: Re: Using two NTP Server: Bad?
Date: Wed, 27 Sep 2023 00:44:16 +0000
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 by: Jimmy Hoke - Wed, 27 Sep 2023 00:44 UTC

On 9/15/23 07:23, RG wrote:
>
> Sync with one server -> If the connection to the NTP server is lost the sync will be lost
> Sync with two servers -> If two servers are configured it is not possible to tell which one provides more accurate time as no other reference times are available to compare.
> Sync with three servers -> If one NTP source is in false-ticker state, the ntpd would be able to choose from the remaining two servers.
>
>

Using multiple NTP servers should be OK for most use cases. For
instance, the default Chrony config for Ubuntu uses multiple servers.
Here is a bit of this default config:

> # This will use (up to):
> # - 4 sources from ntp.ubuntu.com which some are ipv6 enabled
> # - 2 sources from 2.ubuntu.pool.ntp.org which is ipv6 enabled as well
> # - 1 source from [01].ubuntu.pool.ntp.org each (ipv4 only atm)
> # This means by default, up to 6 dual-stack and up to 2 additional
IPv4-only
> # sources will be used.
> # At the same time it retains some protection against one of the
entries being
> # down (compare to just using one of the lines). See (LP: #1754358)
for the
> # discussion.
> #
> # About using servers from the NTP Pool Project in general see (LP:
#104525).
> # Approved by Ubuntu Technical Board on 2011-02-08.
> # See http://www.pool.ntp.org/join.html for more information.
> server 10.6.0.1 iburst prefer trust
> pool ntp.ubuntu.com iburst maxsources 4
> pool 0.ubuntu.pool.ntp.org iburst maxsources 1
> pool 1.ubuntu.pool.ntp.org iburst maxsources 1
> pool 2.ubuntu.pool.ntp.org iburst maxsources 2

What are you using it for?

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server_pubkey.txt

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