options{
    directory "/etc/bind";
    query-source address * port 53;
    forward only ;
    forwarders { 10.10.22.228; 193.136.224.100; };
};
zone "." {
    type hint;
    file "db.root";
};
zone "127.in-addr.arpa" {
    type master;
    file "db.127";
    notify no;
};
zone "grs.deei" {
    type master;
    file "db.hosts";
};
zone "160.11.10.in-addr.arpa" {
    type master;
    file "db.hosts.rev";
};
zone "nerds.grs.deei" {
    type forward;
    forwarders { 10.11.160.1; };
};