Am 21.03.22 um 17:23 schrieb Adam Dinwoodie:
Package: systemd-timesyncd
Version: 250.4-1
Severity: normal
Tags: ipv6

Dear Maintainer,

I'm seeing systemd restart systemd-timesyncd.service approximately every
10 seconds, lining up with when I see a log showing that my router has
advertised its IPv6 address.

If I run `journalctl -f`, the output is full of lines like the
following:

```
Mar 21 15:53:56 lucy.dinwoodie.org dhcpcd[452]: eth0: Router Advertisement from 
fe80::be99:11ff:fe69:4300
Mar 21 15:53:57 lucy.dinwoodie.org systemd[1]: Stopping Network Time 
Synchronization...
Mar 21 15:53:57 lucy.dinwoodie.org systemd[1]: systemd-timesyncd.service: 
Deactivated successfully.
Mar 21 15:53:57 lucy.dinwoodie.org systemd[1]: Stopped Network Time 
Synchronization.
Mar 21 15:53:57 lucy.dinwoodie.org systemd[1]: Starting Network Time 
Synchronization...
Mar 21 15:53:57 lucy.dinwoodie.org systemd[1]: Started Network Time 
Synchronization.
Mar 21 15:53:57 lucy.dinwoodie.org systemd-timesyncd[6426]: Initial 
synchronization to time server 162.159.200.1:123 (0.debian.pool.ntp.org).
Mar 21 15:54:06 lucy.dinwoodie.org dhcpcd[452]: eth0: Router Advertisement from 
fe80::be99:11ff:fe69:4300
Mar 21 15:54:07 lucy.dinwoodie.org systemd[1]: Stopping Network Time 
Synchronization...
Mar 21 15:54:07 lucy.dinwoodie.org systemd[1]: systemd-timesyncd.service: 
Deactivated successfully.
Mar 21 15:54:07 lucy.dinwoodie.org systemd[1]: Stopped Network Time 
Synchronization.
Mar 21 15:54:07 lucy.dinwoodie.org systemd[1]: Starting Network Time 
Synchronization...
Mar 21 15:54:07 lucy.dinwoodie.org systemd[1]: Started Network Time 
Synchronization.
Mar 21 15:54:07 lucy.dinwoodie.org systemd-timesyncd[6463]: Initial 
synchronization to time server 178.62.18.76:123 (0.debian.pool.ntp.org).
```


Is that a result of /etc/dhcp/dhclient-exit-hooks.d/timesyncd ?

What happens if you remove that dhclient hook

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