On Mon, Nov 30, 2020 at 07:22:47PM +0100, Kurt Roeckx wrote: > Hi, > > I'm seeing dropped packets when talking to an NTS enabled server. > But I'm only seeing it on my home network, not on my server in the > datacenter. I currently see this using ptbnts1.ptb.de. I think I > had the same problem with nts.ntp.se, but it seems I changed from > an IPv4 address to an IPv6 address there and don't see the issue > since.
Some major network operators are blocking or rate limiting NTP packets as a mitigation against the ntpd mode-6 amplification attacks. In some networks it specifically applies to longer NTP packets. There is not much we can do except move to a different port, as proposed in the alternative-port draft. -- Miroslav Lichvar -- To unsubscribe email chrony-users-requ...@chrony.tuxfamily.org with "unsubscribe" in the subject. For help email chrony-users-requ...@chrony.tuxfamily.org with "help" in the subject. Trouble? Email listmas...@chrony.tuxfamily.org.