[ntp:questions] NTP orphan mode with manycast configuration

Steve Kostecke kostecke at ntp.org
Tue Aug 14 15:25:50 UTC 2007

On 2007-08-14, sylcournoyer at gmail.com <sylcournoyer at gmail.com> wrote:

> Has anybody been able to make the orphan mode work with manycast
> clients/servers?

Yes, I have with IPv4.

It is easiest to set-up if you use symmetric keys instead of Autokey.

Each node in the "orphan mesh" can use the following files:


# /etc/ntp.conf, configuration for ntpd 
# IPv4 Multicast + Symmetric Keys + Orphan mode

# Adjust for your OS
driftfile /var/lib/ntp/ntp.drift

# Symmetric keys
keys    /etc/ntp.keys
trustedkey 1

# Orphan Mode
tos orphan 5

# Multicast "mesh node" - the order of these directives is critical
broadcast key 1

# Add some server lines here for those systems that will be synchronized
# to remote time servers or local ref-clocks. Append iburst to the
# server lines for remote time servers.


# /etc/ntp.keys
1 M your_shared_password


Please note that you must configure routing for the multicast address on
all of the systems in the "orphan mesh".

FWIW I'm currently running Manycast (w/ Symmetric Keys) / Orphan mode
(over IPv6) on my LAN. ...

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

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