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I'd recommend to keep your kindle offline and to sideload your books, even those bought from amazon: that's simple and effective.
But if you don't want to permanently disable your internet connection you can use iptables (or use the plugin mentioned earlier) to block amazon servers. It will work but for how long? if they use servers in other ip ranges you're screwed.
Another way would be to block connections to most IP subnets and only allow a few services you'd like to use (wikipedia for example). That would be safer but only work if the internet use you intend to do with your ereader is limited to a few servers/services.
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