To alleviate high costs, BIND offers the following option in the options section of named.conf: options { ... dialup yes; heartbeat-interval 360; ... }; When this option executes, BIND concentrates maintenance activities (which normally are spread out over time) to a short time interval, so it occurs all at once. This activity occurs once every heartbeat interval minute. The heartbeat interval number should be many times higher than your dial-up connection timeout. If your timeout is 15 minutes and you set your heartbeat interval to 4 hours, BIND causes as many as 6 connections in 24 hours in other words, roughly 90 minutes of connection time per day for nothing. Shortening the timeout and increasing the heartbeat interval will help decrease this. When set up this way, BIND still originates traffic when the following occurs:
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