DNS split horizon

典型场景是 内外网分离解析 / split-horizon DNS / split-brain DNS：

• 内网客户端访问 www.example.com → 返回 192.168.1.10

• 外网客户端访问 www.example.com → 返回 203.0.113.10

• 测试环境访问同一域名 → 返回测试 IP

  acl "internal" {
10.0.0.0/8;
192.168.0.0/16;
127.0.0.1;
};

  view "internal" {
  match-clients { internal; };
  recursion yes;
  allow-recursion { internal; };

  zone "example.com" {
  type master;
  file "/etc/bind/db.example.com.internal";
  };

  zone "." {
  type hint;
  file "/etc/bind/db.root";
  };
  };

  view "external" {
  match-clients { any; };
  recursion no;

  zone "example.com" {
  type master;
  file "/etc/bind/db.example.com.external";
  };

  zone "." {
type hint;
file "/etc/bind/db.root";
};
};