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為什麼我的 DNS 伺服器不轉送？

tag-icon • tag-icon domain-name-system centos bind
為什麼我的 DNS 伺服器不轉送？

我有這樣的設定綁定：

//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
        listen-on port 53 { any; };
#       listen-on-v6 port 53 { ::1; };
        directory       "/var/named";
        forwarders      { 10.90.0.135; 10.90.0.174; };
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
        allow-query     { any; };
        recursion yes;

        dnssec-enable yes;
        dnssec-validation yes;
        dnssec-lookaside auto;

        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.iscdlv.key";

        managed-keys-directory "/var/named/dynamic";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";


zone "appletop.local" IN {
        type master;
        file "appletop.local";
        allow-update { none; };
};

但不轉發？

如果我只是將 DNS 伺服器位址放入resolv.conf另一台電腦上，我會得到正確的查找，因此DNS 伺服器必須能夠為我解析，但如果我隨後將另一台電腦指向這台計算機，它就無法解析名稱。

怎麼了？

經過 MadHatter 建議的更改後：

現在它啟動了，但掛在 dig +trace 上並且不轉發 - 為什麼我看不到下面的轉發器地址？

[root@ns1 ~]# ping www.yahoo.com
^C
[root@ns1 ~]# cd /etc/
[root@ns1 etc]# cp named.conf named.conf.last
[root@ns1 etc]# vi named.conf
[root@ns1 etc]# /etc/init.d/named reload
Reloading named-sdb:                                       [  OK  ]
[root@ns1 etc]# service named stop
Stopping named: .                                          [  OK  ]
[root@ns1 etc]# /etc/init.d/named start
Starting named:                                            [  OK  ]
[root@ns1 etc]# nslookup www.yahoo.com
;; connection timed out; trying next origin
Server:         10.138.10.30
Address:        10.138.10.30#53

** server can't find www.yahoo.com: NXDOMAIN

並用 +trace 進行挖掘：

[root@ns1 etc]# dig +trace www.yahoo.com

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.0.2.el6_4.6 <<>> +trace www.yahoo.com
;; global options: +cmd
.                       518400  IN      NS      E.ROOT-SERVERS.NET.
.                       518400  IN      NS      M.ROOT-SERVERS.NET.
.                       518400  IN      NS      I.ROOT-SERVERS.NET.
.                       518400  IN      NS      F.ROOT-SERVERS.NET.
.                       518400  IN      NS      G.ROOT-SERVERS.NET.
.                       518400  IN      NS      K.ROOT-SERVERS.NET.
.                       518400  IN      NS      B.ROOT-SERVERS.NET.
.                       518400  IN      NS      A.ROOT-SERVERS.NET.
.                       518400  IN      NS      C.ROOT-SERVERS.NET.
.                       518400  IN      NS      L.ROOT-SERVERS.NET.
.                       518400  IN      NS      J.ROOT-SERVERS.NET.
.                       518400  IN      NS      H.ROOT-SERVERS.NET.
.                       518400  IN      NS      D.ROOT-SERVERS.NET.

我的整個文件現在看起來像這樣 - 出了什麼問題？


 options {
         listen-on port 53 { any; };
 #       listen-on-v6 port 53 { ::1; };
         directory       "/var/named";
         dump-file       "/var/named/data/cache_dump.db";
         statistics-file "/var/named/data/named_stats.txt";
         memstatistics-file "/var/named/data/named_mem_stats.txt";
         allow-query     { any; };
         recursion yes;

         dnssec-enable yes;
         dnssec-validation yes;
         dnssec-lookaside auto;

         /* Path to ISC DLV key */
         bindkeys-file "/etc/named.iscdlv.key";

         managed-keys-directory "/var/named/dynamic"; };

 logging {
         channel default_debug {
                 file "data/named.run";
                 severity dynamic;
         }; };

 zone "." IN {
         type forward;
         forward first;
         forwarders { 10.90.0.135;
                      10.90.0.174;
                    } ; };

 include "/etc/named.rfc1912.zones"; include "/etc/named.root.key";


 zone "appletop.local" IN {
         type master;
         file "appletop.local";
         allow-update { none; }; };

答案1

您已經告訴它要使用哪些轉發器，但沒有告訴它何時使用它們。如果你想讓它們用於所有事情，而不是

zone "." IN {
        type hint;
        file "named.ca";
};

嘗試

zone "." {
        type forward;
        forward first;
        forwarders { 10.90.0.135;
                     10.90.0.174;
                   } ;
} ;

編輯: 好吧，試試看上面的方法。不過，我不明白你所說的「首先嘗試在本地解決」是什麼意思；你說你希望它轉發。

答案2

就我而言，問題僅透過更改dnssec-validation yes;為解決dnssec-validation no;

答案3

以防萬一，MadHatter 的回覆下面的 OP 評論不清楚，“問題是 dnssec”，我明確發布這個答案，因為我也發現它解決了我的問題。

我已經設定了一個快取、僅轉發的 BIND 伺服器，但它不轉發。查詢發送到根伺服器時有幾秒鐘的延遲。停用 dnssec 選項可以修復此問題，現在它可以按預期工作。

dnssec-enable no;
dnssec-validation no;
dnssec-lookaside auto;

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