| Re: [chrony-users] help with bindacqaddress |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] help with bindacqaddress
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Tue, 26 May 2020 09:42:03 +0200
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On Mon, May 25, 2020 at 11:24:41AM -0400, Giacomo Comes wrote:
> with chrony the equivalent command should be:
> bindacqaddress <ip>
> and while this works with a network interface with static
> ip address, it is troublesome with DHCP.
> ( I need to change chrony.conf and and restart chronyd every
> time the ip address changes).
> Am I missing something?
No, there is currently no way to specify the interface for NTP
requests.
> Could bindacqaddress be changed to
> have as argument also the network interface name instead of
> the ip address?
It could, at least in theory. The trouble is with portability. I'm not
sure how to bind a socket to a specific interface on non-Linux
systems. There is a possibility of getting addresses of all
interfaces, but I suspect that would be too expensive to do with each
request. ntpd is continuously tracking all interfaces. That's complex,
requires a lot of OS-specific code, and not really acceptable for
chrony.
As a workaround, maybe you could use policy routing (ip rule) to
select the interface for NTP packets?
--
Miroslav Lichvar
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