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devel / comp.protocols.time.ntp / Specify IP for outgoing sync

Specify IP for outgoing sync

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Subject: Specify IP for outgoing sync
From: blazej.krajnak@gmail.com (Blažej Krajňák)
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by: Blažej Krajňák - Wed, 28 Sep 2022 22:13 UTC

Hi there,

I read the documentation a few times but can not find if it's possible to spcify IP for outgoing connections?

I have server with multiple IP addresses and I need to specify the concrete one to be used to sync with servers/peers. For now, ntpd selects one of the listening interfaces (still the same one, but I can not determine why this one).

Thanks,
Blažej

Re: Specify IP for outgoing sync

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From: david@ex.djwhome.demon.invalid (David Woolley)
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Subject: Re: Specify IP for outgoing sync
Date: Thu, 29 Sep 2022 10:47:29 +0100
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by: David Woolley - Thu, 29 Sep 2022 09:47 UTC

On 28/09/2022 23:13, Blažej Krajňák wrote:
>
> I read the documentation a few times but can not find if it's possible to spcify IP for outgoing connections?
NTP uses UDP, which is connectionless.
>
> I have server with multiple IP addresses and I need to specify the concrete one to be used to sync with servers/peers. For now, ntpd selects one of the listening interfaces (still the same one, but I can not determine why this one).
I would imagine you could do it at the OS level, by ensuring you have
(static) routes to the remote address via specific interfaces. I can't
think why ntpd would bind to anything other than 0.0.0.0.

Subject	Author
Specify IP for outgoing sync	Blažej Krajňák
Re: Specify IP for outgoing sync	David Woolley