Bind9拒绝查询

Question

我创建了一个基于bind9的DNS服务器，只在转发模式下工作：

这是我的named.conf.options文件：

#acl goodclients {
#        localhost;
#        localnets;
#};


options {

        directory "/var/cache/bind";

        // If there is a firewall between you and nameservers you want
        // to talk to, you may need to fix the firewall to allow multiple
        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113

        // If your ISP provided one or more IP addresses for stable
        // nameservers, you probably want to use them as forwarders.
        // Uncomment the following block, and insert the addresses replacing
        // the all-0's placeholder.

        recursion yes;

        #allow-query { goodclients; };

        forwarders {
            8.8.8.8;
            8.8.4.4;
        };
        forward only;

        //========================================================================
        // If BIND logs error messages about the root key being expired,
        // you will need to update your keys.  See https://www.isc.org/bind-keys
        //========================================================================
        dnssec-validation auto;

        auth-nxdomain no;    # conform to RFC1035
        listen-on-v6 { any; };
};

我配置了客户机，一切正常，但我得到了如下错误：

May 15 08:54:49 digitalocean named[3294]: client x.x.x.x#8137 (unix.stackexchange.com): query (cache) 'unix.stackexchange.com/A/IN' denied

其中x.x是我的公共IP地址。

请注意，DNS服务器是公共的，我在客户端配置中使用它的公共IP。

我应该忽略错误消息吗？

当我使用DNS服务器(Y.Y)的公共IP挖掘google.com时：

dig @y.y.y.y google.com


; <<>> DiG 9.9.5-3ubuntu0.8-Ubuntu <<>> @y.y.y.y google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 28091
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;google.com.            IN  A

;; Query time: 15 msec
;; SERVER: y.y.y.y#53(y.y.y.y)
;; WHEN: Sun May 15 14:57:56 CEST 2016
;; MSG SIZE  rcvd: 39

这太让人困惑了。

Answer 1

找到了。解决办法是增加：

allow-query {
            any;
        };

编辑: Ribeiro的解决方案有效，但我需要创建一个公共服务器。如果您想避免安全问题，请参阅评论。

Answer 2

它无法工作，因为您已经注释掉了allow-query和goodclients指令。您应该取消对它们的注释，并使用is /networks来填充goodclients以回答查询。

acl goodclients {
    localhost;
    x.x.x.0/24;
};

options {
    ...
    allow-query { goodclients; };

}

来自http://www.zytrax.com/books/dns/ch7/queries.html#allow-query

允许查询定义了IP地址(Es)的匹配列表，该列表允许向服务器发出查询。

另外，请注意，从BIND 9.4.1-P1开始，allow-query的默认行为从允许变为禁止。

https://kb.isc.org/article/AA-00269/0/What-has-changed-in-the-behavior-of-allow-recursion-and-allow-query-cache.html