我在内核为 3.2.0-86-generic-pae 的 Ubuntu 12.04 LTS 上运行 BIND 9.8.1-P1 缓存服务器。
几个星期以来，我一直在绞尽脑汁试图弄清楚这个问题，但我只是不知道到底发生了什么，而且由于问题非常频繁，我甚至很难重现它。
实际情况是，在打开 Firefox 网络监视器的情况下，在 Firefox 中加载 www.msn.com 等页面时，我偶尔会看到一些请求的 DNS 解析时间从 8000 毫秒到 37000 毫秒不等。当然，一旦我重新加载页面，它就会被缓存，然后工作正常，但即使我刷新服务器和客户端上的缓存，该域也不再是问题。我还没有看到哪些域有问题的模式。我只是不知道如何对此进行故障排除，因为很难对同一个域进行两次复制。
这是我在 named.conf.options 中的全部内容
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.
forwarders {
//OpenDNS
208.67.222.222;
208.67.220.220;
};
auth-nxdomain no; # conform to RFC1035
//listen-on-v6 { any; };
};
我真的很难弄清楚发生了什么，更不用说如何解决它，所以我希望这里有人可以帮忙。
根据要求，这是打开查询日志记录并加载 www.wsj.com 时生成的日志记录。只有 4 个请求的 DNS 响应很慢
tags.bluekai.com 11986ms
Jul 30 17:50:14 fs named[23539]: client 192.168.16.24#55215: query: tags.bluekai.com IN A + (192.168.16.3)
Jul 30 17:50:15 fs named[23539]: client 192.168.16.24#55215: query: tags.bluekai.com IN A + (192.168.16.3)
Jul 30 17:50:16 fs named[23539]: client 192.168.16.24#55215: query: tags.bluekai.com IN A + (192.168.16.3)
Jul 30 17:50:18 fs named[23539]: client 192.168.16.24#55215: query: tags.bluekai.com IN A + (192.168.16.3)
Jul 30 17:50:22 fs named[23539]: client 192.168.16.24#55215: query: tags.bluekai.com IN A + (192.168.16.3)
comcluster.cxense.com 24004ms
Jul 30 17:38:32 fs named[23539]: client 192.168.16.24#52469: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:14 fs named[23539]: client 192.168.16.24#56490: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:14 fs named[23539]: client 192.168.16.24#54692: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:15 fs named[23539]: client 192.168.16.24#54692: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:15 fs named[23539]: client 192.168.16.24#56490: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:16 fs named[23539]: client 192.168.16.24#54692: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:16 fs named[23539]: client 192.168.16.24#56490: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:18 fs named[23539]: client 192.168.16.24#54692: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:18 fs named[23539]: client 192.168.16.24#56490: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:22 fs named[23539]: client 192.168.16.24#56490: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:22 fs named[23539]: client 192.168.16.24#54692: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:26 fs named[23539]: client 192.168.16.24#56963: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:27 fs named[23539]: client 192.168.16.24#56963: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:28 fs named[23539]: client 192.168.16.24#56963: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:28 fs named[23539]: client 192.168.16.24#56963: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:30 fs named[23539]: client 192.168.16.24#56963: query: comcluster.cxense.com IN A + (192.168.16.3)
Jul 30 17:50:34 fs named[23539]: client 192.168.16.24#56963: query: comcluster.cxense.com IN A + (192.168.16.3)
cdn.cxpublic.com 23509ms
Jul 30 17:50:26 fs named[23539]: client 192.168.16.24#57469: query: cdn.cxpublic.com IN A + (192.168.16.3)
Jul 30 17:50:27 fs named[23539]: client 192.168.16.24#57469: query: cdn.cxpublic.com IN A + (192.168.16.3)
Jul 30 17:50:28 fs named[23539]: client 192.168.16.24#57469: query: cdn.cxpublic.com IN A + (192.168.16.3)
Jul 30 17:50:30 fs named[23539]: client 192.168.16.24#57469: query: cdn.cxpublic.com IN A + (192.168.16.3)
Jul 30 17:50:34 fs named[23539]: client 192.168.16.24#57469: query: cdn.cxpublic.com IN A + (192.168.16.3)
www.facebook.com 33666ms
Jul 30 17:39:37 fs named[23539]: client 192.168.16.24#54063: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:26 fs named[23539]: client 192.168.16.24#63809: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:26 fs named[23539]: client 192.168.16.24#61280: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:27 fs named[23539]: client 192.168.16.24#63809: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:27 fs named[23539]: client 192.168.16.24#61280: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:28 fs named[23539]: client 192.168.16.24#63809: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:28 fs named[23539]: client 192.168.16.24#61280: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:30 fs named[23539]: client 192.168.16.24#63809: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:30 fs named[23539]: client 192.168.16.24#61280: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:34 fs named[23539]: client 192.168.16.24#63809: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:34 fs named[23539]: client 192.168.16.24#61280: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:38 fs named[23539]: client 192.168.16.24#64685: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:39 fs named[23539]: client 192.168.16.24#64685: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:40 fs named[23539]: client 192.168.16.24#64685: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:42 fs named[23539]: client 192.168.16.24#64685: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:46 fs named[23539]: client 192.168.16.24#64685: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:50 fs named[23539]: client 192.168.16.24#57121: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:51 fs named[23539]: client 192.168.16.24#57121: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:52 fs named[23539]: client 192.168.16.24#57121: query: www.facebook.com IN A + (192.168.16.3)
Jul 30 17:50:54 fs named[23539]: client 192.168.16.24#57121: query: www.facebook.com IN A + (192.168.16.3)
答案1
感谢所有帮助我解决这个问题的人，但我似乎无意中解决了这个问题。更换路由器似乎完全消除了这个问题。我已经在 Firefox 中对从 Alexa 500 加载各种页面进行了广泛的测试，我再也无法重现这个问题了。我更换的路由器非常旧，我更换它并不是为了解决这个问题，但看起来旧路由器是我遇到的问题的根源。
记录显示旧路由器是 Netgear WGR614v5，我用 TP-LINK Archer C7 替换了它。