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22.16.11. Configuring the iburst Option

To improve the time taken for initial synchronization, add the following option to the end of a server command:
When the server is unreachable, send a burst of eight packets instead of the usual one packet. The packet spacing is normally 2 s; however, the spacing between the first and second packets can be changed with the calldelay command to allow additional time for a modem or ISDN call to complete. For use with the server command to reduce the time taken for initial synchronization. As of Red Hat Enterprise Linux 6.5, this is now a default option in the configuration file.