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In the book "DNS and BIND" 5th Edition, it says in the Multiple Master Servers section

Are there other ways to make your slave nameserver's configuration more robust? Yes -- you can specify up to 10 IP addresses on master servers. In the configuration file, add them after the first IP Address and separate them with semicolons:

zone "movie.edu" in {
    type slave;
    file "bak.movie.edu";
    masters { 192.249.249.3; 192.249.249.4; };
};

Is this limit of 10 servers true though? I can't see that documented anywhere. Is it configurable or hard-coded?

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