Re: [Astlinux-users] Looking to implement DNS-TLS

[Lonnie A. <li...@lo...>]

Hi Michael,

Not sure what you mean by "dyn-dns plugin"?  Plugin to what?

In this day and age, certificates that depend on the system to have a valid time are quite common.

If you are using Network tab -> "Dynamic DNS Update:", the update will use HTTPS (via curl) to secure your credentials, which will require a valid system time.  Note the "Dynamic DNS Update:" (set external DNS record) has nothing to do with "DNS-TLS" (retrieve DNS).

The AstLinux system clock is maintained via one or more of:

1) CMOS flash with battery RTC (bare metal)

2) Virtual Machine host provides date/time (VM)

3) Time is set on startup using chrony using Network tab -> "Network Time Settings:"


While I have not had any practical issues over the years using "DNS-TLS", you can either use a manual IPv4 address in "Network Time Settings:" or use the /mnt/kd/dnsmasq.static trick as described here [1] to "almost" guarantee the clock is valid at startup.

Lonnie

[1] https://doc.astlinux-project.org/userdoc:tt_dns_tls_proxy#possible_startup_issues




> On Aug 10, 2023, at 1:28 AM, Michael Knill <mic...@ip...> wrote:
> 
> Hi Group
>  
> I’m currently using the dyn-dns plugin and wanting to extend it for additional Astlinux access.
> I’m concerned that DNS traffic is currently not being encrypted so I want to use DNS-TLS.
>  
> I have two questions:
> 	• As you have mentioned in the notes, as it relies on reasonably correct time which needs DNS to be set correctly, I am concerned that we will not be able to access the system with dyn-dns if this occurs. Should I implement the workaround for this in /mnt/kd/dnsmasq.static always?
> 	• I currently have 1.1.1.1 & 8.8.8.8 configured as my standard DNS. I assume this is not possible with the DNS Proxy and DNSSEC? I do realise that Anycast DNS is very close to 100% uptime but I’m just cautious.
>  
> Regards
>  
> Michael Knill
> Managing Director
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