6 Aug
2019
6 Aug
'19
16:07
James Knott wrote:
> On 2019-08-06 11:22 AM, Per Jessen wrote:
>> James Knott wrote:
>>
>>> On my home network, I have my firewall providing NTP and in turn
>>> connecting to a public NTP server. I access my firewall NTP server
>>> by host name, which will return both IPv4 and IPv6 addresses. In
>>> watching the NTP traffic between my desktop computer and firewall, I
>>> see both IPv4 and IPv6 addresses alternately being used. Is this
>>> the way the NTP client normally works? I could understand it trying
>>> multiple addresses, if that is what I provided, but I only provide a
>>> single host name, that returns both IPv4 and IPv6 addresses.
>>> Normally, with other apps, IPv6 is preferred over IPv4.
>> I have never looked at the traffic, only at the output of 'ntpq -pn'
>> - sometime I see ipv4, some times I see ipv6.
>>
>>
>
> I have also noticed sometimes I get 2 IPv6 requests in a row, but
> haven't seen 2 IPv4 yet.
> It's not a problem, but I am curious as to why it happens, when
> normally IPv6 is preferred.
Yeah - on your local network it seems odd, but otherwise I guess there
could be differences that make an ipv6 connection better than an ipv4,
or vice versa?
On a 15.1 server I have running externally -
server ntp1.hetzner.de iburst
server ntp2.hetzner.com iburst
server ntp3.hetzner.net iburst
peer beaufort15.enidan.ch
peer beaufort2.enidan.ch
tattoo16:~ # ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
+2a01:4f8:0:a0a1 237.17.204.95 2 u 635 1024 377 2.732 -1.105 0.148
+2a01:4f8:0:a112 124.216.164.14 2 u 387 1024 377 0.344 0.624 0.158
*2a01:4f8:0:a101 124.216.164.14 2 u 1020 1024 377 0.383 0.236 1.132
2a01:4f8:130:30 122.227.206.195 3 s 6h 1024 0 0.342 0.844 0.000
-2a01:4f8:121:43 213.239.239.166 3 s 927 1024 377 0.329 2.549 2.720
--
Per Jessen, Zürich (22.2°C)
http://www.dns24.ch/ - your free DNS host, made in Switzerland.
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