Question

我正在尝试弄清为什么对在服务器上运行的dnsmasq的第一个DNS查询我的局域网上的服务器遭受5秒的延迟，但随后的请求没有看到延迟。

我正在Raspberry Pi上运行dnsmasq版本2.76。系统在他们发送查询时看到延迟（主要是在运行xubuntu） 19.10。

仅当在LAN上查询名称，请求外部名称正常运行。我是否全力以赴都没关系限定名称或仅是机器名称（域名由 /etc/resolv.con中的“搜索”选项。

这似乎与IPV6和AAAA记录有关（或缺乏）导致问题的原因，但我仍然对如何解决感到困惑它。

在/etc/dnsmasq.conf中设置了'log-queries = extra'，我看到了当我查询（使用“主机”）名称时，在/ var / log / syslog中启动后，从我的笔记本电脑两次“ esprimo” 是）。

第一个“主持人esprimo”：-

    Mar 23 12:59:06 newdns dnsmasq[4256]: 54 192.168.1.92/56886 query[A] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 54 192.168.1.92/56886 /etc/hosts esprimo.zbmc.eu is 192.168.1.3
Mar 23 12:59:06 newdns dnsmasq[4256]: 55 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 55 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 56 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 56 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 57 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 57 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 58 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 58 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 59 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 59 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 60 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 60 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 61 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 61 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 62 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 62 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 63 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 63 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 64 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 64 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 65 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 65 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 66 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 66 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 67 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 67 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 68 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 68 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 69 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 69 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 70 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 70 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 71 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 71 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 72 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 72 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 73 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 73 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 74 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 74 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 75 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 75 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 76 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 76 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 77 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 77 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:06 newdns dnsmasq[4256]: 78 192.168.1.92/37906 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:06 newdns dnsmasq[4256]: 78 192.168.1.92/37906 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:11 newdns dnsmasq[4256]: 79 192.168.1.92/35896 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:11 newdns dnsmasq[4256]: 79 192.168.1.92/35896 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:11 newdns dnsmasq[4256]: 80 192.168.1.92/48696 query[MX] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:11 newdns dnsmasq[4256]: 80 192.168.1.92/48696 config esprimo.zbmc.eu is NODATA

第二个“主持人esprimo”：-

Mar 23 12:59:25 newdns dnsmasq[4256]: 91 192.168.1.92/56179 query[A] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:25 newdns dnsmasq[4256]: 91 192.168.1.92/56179 /etc/hosts esprimo.zbmc.eu is 192.168.1.3
Mar 23 12:59:25 newdns dnsmasq[4256]: 92 192.168.1.92/59553 query[AAAA] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:25 newdns dnsmasq[4256]: 92 192.168.1.92/59553 config esprimo.zbmc.eu is NODATA-IPv6
Mar 23 12:59:25 newdns dnsmasq[4256]: 93 192.168.1.92/32976 query[MX] esprimo.zbmc.eu from 192.168.1.92
Mar 23 12:59:25 newdns dnsmasq[4256]: 93 192.168.1.92/32976 config esprimo.zbmc.eu is NODATA

因此出于某种原因第一次查询系统会询问反复获取AAAA记录，然后等待5秒钟，再次询问并然后放弃。但只有在第一次发送查询。（我怀疑延迟是在很长的空闲时间后再次发生，但我无法通过清除systemd resolvctl缓存来重现延迟）

我意识到这可能不直接是dnsmasq问题，但我想非常感谢任何可能对我有帮助的建议或解决方法解决此问题。我可以轻松添加更多调试标志或配置，如果他们可能会帮助。

局域网名称查找，dnsmasq服务器，延迟5秒

0 个答案: