最近在搭建私域解析服务的时候，使用到了Bind。但是递归解析无法正常工作。

查看日志发现大量错误：

network unreachable resolving './DNSKEY/IN': 2001:500:1::53#53
network unreachable resolving './NS/IN': 2001:500:1::53#53
network unreachable resolving './DNSKEY/IN': 2001:500:9f::42#53
network unreachable resolving './NS/IN': 2001:500:9f::42#53
network unreachable resolving './DNSKEY/IN': 2001:500:2d::d#53
network unreachable resolving './NS/IN': 2001:500:2d::d#53
network unreachable resolving './DNSKEY/IN': 2001:500:200::b#53
network unreachable resolving './NS/IN': 2001:500:200::b#53

Bind在尝试使用IPv6进行解析，但是我们的服务器又不支持IPv6网络。故只需要在Bind配置文件中将IPv6监听关闭。

echo "OPTIONS="-4"' >> /etc/sysconfig/named
systemctl restart named

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