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Once you have MulticastRoutes set up, you can configure network time synchronization (via the Network Time Protocol, [NTP|http://www.ntp.org]) to use multicast. Theoretically this could significantly reduce the load on your time server. Also, it generalizes the configuration of your clients, since they no longer have to be pointed at a specific time server. I have only been able to make this work totally correctly with ntp v4.0.99k and later. * Add a 'broadcast' entry to /etc/ntp.conf on the ntp server(s):%%% broadcast 224.0.1.1 # broadcast to the multicast address. * Remove all 'server' entries from /etc/ntp.conf on client systems. * Add a multicast client entry to /etc/ntp.conf on each client: multicastclient # listen on the reserved ntp multicast address of 224.0.1.1 ''Optional'': The unix ntp client will refuse to start up if the system clock is more than 1 hour off the server clock. If you know the server is always right, you can add a call to 'ntpdate' before ntpd starts. This happens automatically under !RedHat if the file /etc/ntp/step-tickers exists and contains a list of servers. If you place only the address '224.0.0.1' in this file, ntpdate will set the system clock to the time that is being multicasted. I don't know why, but this address has to be 224.0.0.1, not 224.0.1.1. Under other Unix-ish OSes, you can accomplish the same with a call to ntpdate in an rc script before ntpd starts: ntpdate 224.0.0.1 Now that you have this configured and ntpd restarted on all the systems, test it out: * ntpq -p should print the name of every multicast server that the system is synchronized to. * ntpdate -q 224.0.0.1 should report the time on every multicast server. (Let the server run a few minutes before trying these out, to give everything time to start up and stabilize)
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